diff --git a/csrc/mmdeploy/apis/python/classifier.cpp b/csrc/mmdeploy/apis/python/classifier.cpp
index cb7188a03..7467a5706 100644
--- a/csrc/mmdeploy/apis/python/classifier.cpp
+++ b/csrc/mmdeploy/apis/python/classifier.cpp
@@ -57,9 +57,12 @@ class PyClassifier {
 static void register_python_classifier(py::module &m) {
   py::class_<PyClassifier>(m, "Classifier")
       .def(py::init([](const char *model_path, const char *device_name, int device_id) {
-        return std::make_unique<PyClassifier>(model_path, device_name, device_id);
-      }))
-      .def("__call__", &PyClassifier::Apply);
+             return std::make_unique<PyClassifier>(model_path, device_name, device_id);
+           }),
+           py::arg("model_path"), py::arg("device_name"), py::arg("device_id") = 0)
+      .def("__call__",
+           [](PyClassifier *self, const PyImage &img) { return self->Apply(std::vector{img})[0]; })
+      .def("batch", &PyClassifier::Apply);
 }
 
 class PythonClassifierRegisterer {
diff --git a/csrc/mmdeploy/apis/python/detector.cpp b/csrc/mmdeploy/apis/python/detector.cpp
index e47fac301..645ec820f 100644
--- a/csrc/mmdeploy/apis/python/detector.cpp
+++ b/csrc/mmdeploy/apis/python/detector.cpp
@@ -68,9 +68,14 @@ class PyDetector {
 static void register_python_detector(py::module &m) {
   py::class_<PyDetector>(m, "Detector")
       .def(py::init([](const char *model_path, const char *device_name, int device_id) {
-        return std::make_unique<PyDetector>(model_path, device_name, device_id);
-      }))
-      .def("__call__", &PyDetector::Apply);
+             return std::make_unique<PyDetector>(model_path, device_name, device_id);
+           }),
+           py::arg("model_path"), py::arg("device_name"), py::arg("device_id") = 0)
+      .def("__call__",
+           [](PyDetector *self, const PyImage &img) -> py::tuple {
+             return self->Apply(std::vector{img})[0];
+           })
+      .def("batch", &PyDetector::Apply);
 }
 
 class PythonDetectorRegisterer {
diff --git a/csrc/mmdeploy/apis/python/pose_detector.cpp b/csrc/mmdeploy/apis/python/pose_detector.cpp
index b19cc1027..db7617131 100644
--- a/csrc/mmdeploy/apis/python/pose_detector.cpp
+++ b/csrc/mmdeploy/apis/python/pose_detector.cpp
@@ -11,22 +11,22 @@ namespace mmdeploy {
 
 using Rect = std::array<float, 4>;
 
-class PyPoseDedector {
+class PyPoseDetector {
  public:
-  PyPoseDedector(const char *model_path, const char *device_name, int device_id) {
+  PyPoseDetector(const char *model_path, const char *device_name, int device_id) {
     auto status =
         mmdeploy_pose_detector_create_by_path(model_path, device_name, device_id, &detector_);
     if (status != MMDEPLOY_SUCCESS) {
       throw std::runtime_error("failed to create pose_detector");
     }
   }
-  py::list Apply(const std::vector<PyImage> &imgs, const std::vector<std::vector<Rect>> &vboxes) {
-    if (imgs.size() == 0 && vboxes.size() == 0) {
+  py::list Apply(const std::vector<PyImage> &imgs, const std::vector<std::vector<Rect>> &bboxes) {
+    if (imgs.size() == 0 && bboxes.size() == 0) {
       return py::list{};
     }
-    if (vboxes.size() != 0 && vboxes.size() != imgs.size()) {
+    if (bboxes.size() != 0 && bboxes.size() != imgs.size()) {
       std::ostringstream os;
-      os << "imgs length not equal with vboxes [" << imgs.size() << " vs " << vboxes.size() << "]";
+      os << "imgs length not equal with vboxes [" << imgs.size() << " vs " << bboxes.size() << "]";
       throw std::invalid_argument(os.str());
     }
 
@@ -39,7 +39,7 @@ class PyPoseDedector {
       mats.push_back(mat);
     }
 
-    for (auto _boxes : vboxes) {
+    for (auto _boxes : bboxes) {
       for (auto _box : _boxes) {
         mmdeploy_rect_t box = {_box[0], _box[1], _box[2], _box[3]};
         boxes.push_back(box);
@@ -48,7 +48,7 @@ class PyPoseDedector {
     }
 
     // full image
-    if (vboxes.size() == 0) {
+    if (bboxes.size() == 0) {
       for (int i = 0; i < mats.size(); i++) {
         mmdeploy_rect_t box = {0.f, 0.f, mats[i].width - 1.f, mats[i].height - 1.f};
         boxes.push_back(box);
@@ -89,7 +89,7 @@ class PyPoseDedector {
     mmdeploy_pose_detector_release_result(detection, total);
     return output;
   }
-  ~PyPoseDedector() {
+  ~PyPoseDetector() {
     mmdeploy_pose_detector_destroy(detector_);
     detector_ = {};
   }
@@ -99,12 +99,33 @@ class PyPoseDedector {
 };
 
 static void register_python_pose_detector(py::module &m) {
-  py::class_<PyPoseDedector>(m, "PoseDetector")
+  py::class_<PyPoseDetector>(m, "PoseDetector")
       .def(py::init([](const char *model_path, const char *device_name, int device_id) {
-        return std::make_unique<PyPoseDedector>(model_path, device_name, device_id);
-      }))
-      .def("__call__", &PyPoseDedector::Apply, py::arg("imgs"),
-           py::arg("vboxes") = std::vector<std::vector<Rect>>());
+             return std::make_unique<PyPoseDetector>(model_path, device_name, device_id);
+           }),
+           py::arg("model_path"), py::arg("device_name"), py::arg("device_id") = 0)
+      .def("__call__",
+           [](PyPoseDetector *self, const PyImage &img) -> py::array {
+             return self->Apply({img}, {})[0];
+           })
+      .def(
+          "__call__",
+          [](PyPoseDetector *self, const PyImage &img, const Rect &box) -> py::array {
+            std::vector<std::vector<Rect>> bboxes;
+            bboxes.push_back({box});
+            return self->Apply({img}, bboxes)[0];
+          },
+          py::arg("img"), py::arg("box"))
+      .def(
+          "__call__",
+          [](PyPoseDetector *self, const PyImage &img, const std::vector<Rect> &bboxes) {
+            std::vector<std::vector<Rect>> _bboxes;
+            _bboxes.push_back(bboxes);
+            return self->Apply({img}, _bboxes);
+          },
+          py::arg("img"), py::arg("bboxes"))
+      .def("batch", &PyPoseDetector::Apply, py::arg("imgs"),
+           py::arg("bboxes") = std::vector<std::vector<Rect>>());
 }
 
 class PythonPoseDetectorRegisterer {
diff --git a/csrc/mmdeploy/apis/python/restorer.cpp b/csrc/mmdeploy/apis/python/restorer.cpp
index 33ff52f4e..4a345be2d 100644
--- a/csrc/mmdeploy/apis/python/restorer.cpp
+++ b/csrc/mmdeploy/apis/python/restorer.cpp
@@ -49,9 +49,14 @@ class PyRestorer {
 static void register_python_restorer(py::module &m) {
   py::class_<PyRestorer>(m, "Restorer")
       .def(py::init([](const char *model_path, const char *device_name, int device_id) {
-        return std::make_unique<PyRestorer>(model_path, device_name, device_id);
-      }))
-      .def("__call__", &PyRestorer::Apply);
+             return std::make_unique<PyRestorer>(model_path, device_name, device_id);
+           }),
+           py::arg("model_path"), py::arg("device_name"), py::arg("device_id") = 0)
+      .def("__call__",
+           [](PyRestorer *self, const PyImage &img) -> py::array {
+             return self->Apply(std::vector{img})[0];
+           })
+      .def("batch", &PyRestorer::Apply);
 }
 
 class PythonRestorerRegisterer {
diff --git a/csrc/mmdeploy/apis/python/rotated_detector.cpp b/csrc/mmdeploy/apis/python/rotated_detector.cpp
index 1624359ff..df2c9ea7c 100644
--- a/csrc/mmdeploy/apis/python/rotated_detector.cpp
+++ b/csrc/mmdeploy/apis/python/rotated_detector.cpp
@@ -64,9 +64,14 @@ class PyRotatedDetector {
 static void register_python_rotated_detector(py::module &m) {
   py::class_<PyRotatedDetector>(m, "RotatedDetector")
       .def(py::init([](const char *model_path, const char *device_name, int device_id) {
-        return std::make_unique<PyRotatedDetector>(model_path, device_name, device_id);
-      }))
-      .def("__call__", &PyRotatedDetector::Apply);
+             return std::make_unique<PyRotatedDetector>(model_path, device_name, device_id);
+           }),
+           py::arg("model_path"), py::arg("device_name"), py::arg("device_id") = 0)
+      .def("__call__",
+           [](PyRotatedDetector *self, const PyImage &img) -> py::tuple {
+             return self->Apply(std::vector{img})[0];
+           })
+      .def("batch", &PyRotatedDetector::Apply);
 }
 
 class PythonRotatedDetectorRegisterer {
diff --git a/csrc/mmdeploy/apis/python/segmentor.cpp b/csrc/mmdeploy/apis/python/segmentor.cpp
index 459298ec1..2132e4c03 100644
--- a/csrc/mmdeploy/apis/python/segmentor.cpp
+++ b/csrc/mmdeploy/apis/python/segmentor.cpp
@@ -50,9 +50,14 @@ class PySegmentor {
 static void register_python_segmentor(py::module &m) {
   py::class_<PySegmentor>(m, "Segmentor")
       .def(py::init([](const char *model_path, const char *device_name, int device_id) {
-        return std::make_unique<PySegmentor>(model_path, device_name, device_id);
-      }))
-      .def("__call__", &PySegmentor::Apply);
+             return std::make_unique<PySegmentor>(model_path, device_name, device_id);
+           }),
+           py::arg("model_path"), py::arg("device_name"), py::arg("device_id") = 0)
+      .def("__call__",
+           [](PySegmentor *self, const PyImage &img) -> py::array {
+             return self->Apply(std::vector{img})[0];
+           })
+      .def("batch", &PySegmentor::Apply);
 }
 
 class PythonSegmentorRegisterer {
diff --git a/csrc/mmdeploy/apis/python/text_detector.cpp b/csrc/mmdeploy/apis/python/text_detector.cpp
index 1181363e7..fb1975370 100644
--- a/csrc/mmdeploy/apis/python/text_detector.cpp
+++ b/csrc/mmdeploy/apis/python/text_detector.cpp
@@ -58,9 +58,14 @@ class PyTextDetector {
 static void register_python_text_detector(py::module &m) {
   py::class_<PyTextDetector>(m, "TextDetector")
       .def(py::init([](const char *model_path, const char *device_name, int device_id) {
-        return std::make_unique<PyTextDetector>(model_path, device_name, device_id);
-      }))
-      .def("__call__", &PyTextDetector::Apply);
+             return std::make_unique<PyTextDetector>(model_path, device_name, device_id);
+           }),
+           py::arg("model_path"), py::arg("device_name"), py::arg("device_id") = 0)
+      .def("__call__",
+           [](PyTextDetector *self, const PyImage &img) -> py::array {
+             return self->Apply(std::vector{img})[0];
+           })
+      .def("batch", &PyTextDetector::Apply);
 }
 
 class PythonTextDetectorRegisterer {
diff --git a/csrc/mmdeploy/apis/python/text_recognizer.cpp b/csrc/mmdeploy/apis/python/text_recognizer.cpp
index 2ac1fdb97..4b6b13434 100644
--- a/csrc/mmdeploy/apis/python/text_recognizer.cpp
+++ b/csrc/mmdeploy/apis/python/text_recognizer.cpp
@@ -36,6 +36,27 @@ class PyTextRecognizer {
     mmdeploy_text_recognizer_release_result(results, (int)mats.size());
     return output;
   }
+  std::vector<std::tuple<std::string, std::vector<float>>> Apply(const PyImage &img,
+                                                                 const std::vector<float> &bboxes) {
+    if (bboxes.size() * sizeof(float) % sizeof(mmdeploy_text_detection_t)) {
+      throw std::invalid_argument("bboxes is not a list of 'mmdeploy_text_detection_t'");
+    }
+    auto mat = GetMat(img);
+    int bbox_count = bboxes.size() * sizeof(float) / sizeof(mmdeploy_text_detection_t);
+    mmdeploy_text_recognition_t *results{};
+    auto status = mmdeploy_text_recognizer_apply_bbox(
+        recognizer_, &mat, 1, (mmdeploy_text_detection_t *)bboxes.data(), &bbox_count, &results);
+    if (status != MMDEPLOY_SUCCESS) {
+      throw std::runtime_error("failed to apply text_recognizer, code: " + std::to_string(status));
+    }
+    auto output = std::vector<std::tuple<std::string, std::vector<float>>>{};
+    for (int i = 0; i < bbox_count; ++i) {
+      std::vector<float> score(results[i].score, results[i].score + results[i].length);
+      output.emplace_back(results[i].text, std::move(score));
+    }
+    mmdeploy_text_recognizer_release_result(results, bbox_count);
+    return output;
+  }
   ~PyTextRecognizer() {
     mmdeploy_text_recognizer_destroy(recognizer_);
     recognizer_ = {};
@@ -48,9 +69,14 @@ class PyTextRecognizer {
 static void register_python_text_recognizer(py::module &m) {
   py::class_<PyTextRecognizer>(m, "TextRecognizer")
       .def(py::init([](const char *model_path, const char *device_name, int device_id) {
-        return std::make_unique<PyTextRecognizer>(model_path, device_name, device_id);
-      }))
-      .def("__call__", &PyTextRecognizer::Apply);
+             return std::make_unique<PyTextRecognizer>(model_path, device_name, device_id);
+           }),
+           py::arg("model_path"), py::arg("device_name"), py::arg("device_id") = 0)
+      .def("__call__", [](PyTextRecognizer *self,
+                          const PyImage &img) { return self->Apply(std::vector{img})[0]; })
+      .def("__call__", [](PyTextRecognizer *self, const PyImage &img,
+                          const std::vector<float> &bboxes) { return self->Apply(img, bboxes); })
+      .def("batch", py::overload_cast<const std::vector<PyImage> &>(&PyTextRecognizer::Apply));
 }
 
 class PythonTextRecognizerRegisterer {
diff --git a/demo/python/image_classification.py b/demo/python/image_classification.py
index aae3f744b..9ef5ce103 100644
--- a/demo/python/image_classification.py
+++ b/demo/python/image_classification.py
@@ -8,11 +8,11 @@ from mmdeploy_python import Classifier
 def parse_args():
     parser = argparse.ArgumentParser(
         description='show how to use sdk python api')
+    parser.add_argument('device_name', help='name of device, cuda or cpu')
     parser.add_argument(
-        'model_path', help='the directory path of mmdeploy model')
-    parser.add_argument('image_path', help='the path of an image')
-    parser.add_argument(
-        '--device-name', default='cpu', help='the name of device, cuda or cpu')
+        'model_path',
+        help='path of mmdeploy SDK model dumped by model converter')
+    parser.add_argument('image_path', help='path of an image')
     args = parser.parse_args()
     return args
 
@@ -21,9 +21,10 @@ def main():
     args = parse_args()
 
     img = cv2.imread(args.image_path)
-    classifier = Classifier(args.model_path, args.device_name, 0)
-    result = classifier([img])
-    for label_id, score in result[0]:
+    classifier = Classifier(
+        model_path=args.model_path, device_name=args.device_name, device_id=0)
+    result = classifier(img)
+    for label_id, score in result:
         print(label_id, score)
 
 
diff --git a/demo/python/image_restorer.py b/demo/python/image_restorer.py
index 8b0274c62..ed10b153f 100644
--- a/demo/python/image_restorer.py
+++ b/demo/python/image_restorer.py
@@ -8,11 +8,10 @@ from mmdeploy_python import Restorer
 def parse_args():
     parser = argparse.ArgumentParser(
         description='show how to use sdk python api')
+    parser.add_argument('device_name', help='name of device, cuda or cpu')
     parser.add_argument(
-        'model_path', help='the directory path of mmdeploy model')
-    parser.add_argument('image_path', help='the path of an image')
-    parser.add_argument(
-        '--device-name', default='cpu', help='the name of device, cuda or cpu')
+        'model_path', help='path of SDK model dumped by model converter')
+    parser.add_argument('image_path', help='path of an image')
     args = parser.parse_args()
     return args
 
@@ -22,8 +21,9 @@ def main():
 
     img = cv2.imread(args.image_path)
 
-    restorer = Restorer(args.model_path, args.device_name, 0)
-    result = restorer([img])[0]
+    restorer = Restorer(
+        model_path=args.model_path, device_name=args.device_name, device_id=0)
+    result = restorer(img)
 
     # convert to BGR
     result = result[..., ::-1]
diff --git a/demo/python/image_segmentation.py b/demo/python/image_segmentation.py
index 3c106a565..32391f434 100644
--- a/demo/python/image_segmentation.py
+++ b/demo/python/image_segmentation.py
@@ -9,11 +9,11 @@ from mmdeploy_python import Segmentor
 def parse_args():
     parser = argparse.ArgumentParser(
         description='show how to use sdk python api')
+    parser.add_argument('device_name', help='name of device, cuda or cpu')
     parser.add_argument(
-        'model_path', help='the directory path of mmdeploy model')
-    parser.add_argument('image_path', help='the path of an image')
-    parser.add_argument(
-        '--device-name', default='cpu', help='the name of device, cuda or cpu')
+        'model_path',
+        help='path of mmdeploy SDK model dumped by model converter')
+    parser.add_argument('image_path', help='path of an image')
     args = parser.parse_args()
     return args
 
@@ -32,8 +32,9 @@ def main():
 
     img = cv2.imread(args.image_path)
 
-    segmentor = Segmentor(args.model_path, args.device_name, 0)
-    seg = segmentor([img])[0]
+    segmentor = Segmentor(
+        model_path=args.model_path, device_name=args.device_name, device_id=0)
+    seg = segmentor(img)
 
     palette = get_palette()
     color_seg = np.zeros((seg.shape[0], seg.shape[1], 3), dtype=np.uint8)
diff --git a/demo/python/object_detection.py b/demo/python/object_detection.py
index 8a9df839e..a584d4dd4 100644
--- a/demo/python/object_detection.py
+++ b/demo/python/object_detection.py
@@ -2,18 +2,17 @@
 import argparse
 
 import cv2
-import numpy as np
 from mmdeploy_python import Detector
 
 
 def parse_args():
     parser = argparse.ArgumentParser(
         description='show how to use sdk python api')
+    parser.add_argument('device_name', help='name of device, cuda or cpu')
     parser.add_argument(
-        'model_path', help='the directory path of mmdeploy model')
-    parser.add_argument('image_path', help='the path of an image')
-    parser.add_argument(
-        '--device-name', default='cpu', help='the name of device, cuda or cpu')
+        'model_path',
+        help='path of mmdeploy SDK model dumped by model converter')
+    parser.add_argument('image_path', help='path of an image')
     args = parser.parse_args()
     return args
 
@@ -22,11 +21,9 @@ def main():
     args = parse_args()
 
     img = cv2.imread(args.image_path)
-    detector = Detector(args.model_path, args.device_name, 0)
-    bboxes, labels, masks = detector([img])[0]
-    assert (isinstance(bboxes, np.ndarray))
-    assert (isinstance(labels, np.ndarray))
-    assert (isinstance(masks, list))
+    detector = Detector(
+        model_path=args.model_path, device_name=args.device_name, device_id=0)
+    bboxes, labels, masks = detector(img)
 
     indices = [i for i in range(len(bboxes))]
     for index, bbox, label_id in zip(indices, bboxes, labels):
diff --git a/demo/python/ocr.py b/demo/python/ocr.py
index b6d2dda08..6f02b5b04 100644
--- a/demo/python/ocr.py
+++ b/demo/python/ocr.py
@@ -2,23 +2,26 @@
 import argparse
 
 import cv2
-from mmdeploy_python import TextDetector
+from mmdeploy_python import TextDetector, TextRecognizer
 
 
 def parse_args():
     parser = argparse.ArgumentParser(
         description='show how to use sdk python api')
+    parser.add_argument('device_name', help='name of device, cuda or cpu')
+    parser.add_argument('image_path', help='path of an image')
     parser.add_argument(
         '--textdet',
         default='',
-        help='the directory path of mmdeploy text-detector sdk model')
+        help='path of mmdeploy text-detector SDK model dumped by'
+        'model converter',
+    )
     parser.add_argument(
         '--textrecog',
         default='',
-        help='the directory path of mmdeploy text-recognizer sdk model')
-    parser.add_argument('image_path', help='the path of an image')
-    parser.add_argument(
-        '--device-name', default='cpu', help='the name of device, cuda or cpu')
+        help='path of mmdeploy text-recognizer SDK model dumped by'
+        'model converter',
+    )
     args = parser.parse_args()
     return args
 
@@ -29,15 +32,37 @@ def main():
     img = cv2.imread(args.image_path)
 
     if args.textdet:
-        detector = TextDetector(args.textdet, args.device_name, 0)
-        bboxes = detector([img])[0]
+        detector = TextDetector(
+            model_path=args.textdet, device_name=args.device_name, device_id=0)
+        bboxes = detector(img)
+        print(f'bboxes.shape={bboxes.shape}')
+        print(f'bboxes={bboxes}')
+        if len(bboxes) > 0:
+            pts = ((bboxes[:, 0:8] + 0.5).reshape(len(bboxes), -1,
+                                                  2).astype(int))
+            cv2.polylines(img, pts, True, (0, 255, 0), 2)
+            cv2.imwrite('output_ocr.png', img)
 
-        pts = (bboxes[:, 0:8] + 0.5).reshape(len(bboxes), -1, 2).astype(int)
-        cv2.polylines(img, pts, True, (0, 255, 0), 2)
-        cv2.imwrite('output_ocr.png', img)
+        if len(bboxes) > 0 and args.textrecog:
+            recognizer = TextRecognizer(
+                model_path=args.textrecog,
+                device_name=args.device_name,
+                device_id=0,
+            )
+            texts = recognizer(img, bboxes.flatten().tolist())
+            print(texts)
 
-    if args.textrecog:
-        print('API of TextRecognizer does not support bbox as argument yet')
+    elif args.textrecog:
+        recognizer = TextRecognizer(
+            model_path=args.textrecog,
+            device_name=args.device_name,
+            device_id=0,
+        )
+        texts = recognizer(img)
+        print(texts)
+    else:
+        print('do nothing since neither text detection sdk model or '
+              'text recognition sdk model in input')
 
 
 if __name__ == '__main__':
diff --git a/demo/python/pose_detection.py b/demo/python/pose_detection.py
index d5656b5af..2eebd12bb 100644
--- a/demo/python/pose_detection.py
+++ b/demo/python/pose_detection.py
@@ -9,16 +9,17 @@ from mmdeploy_python import PoseDetector
 def parse_args():
     parser = argparse.ArgumentParser(
         description='show how to use sdk python api')
+    parser.add_argument('device_name', help='name of device, cuda or cpu')
     parser.add_argument(
-        'model_path', help='the directory path of mmdeploy model')
-    parser.add_argument('image_path', help='the path of an image')
+        'model_path',
+        help='path of mmdeploy SDK model dumped by model converter')
+    parser.add_argument('image_path', help='path of an image')
     parser.add_argument(
         '--bbox',
         default=None,
         nargs='+',
+        type=int,
         help='bounding box of an object in format (x, y, w, h)')
-    parser.add_argument(
-        '--device-name', default='cpu', help='the name of device, cuda or cpu')
     args = parser.parse_args()
     return args
 
@@ -28,17 +29,18 @@ def main():
 
     img = cv2.imread(args.image_path)
 
-    bboxes = []
+    detector = PoseDetector(
+        model_path=args.model_path, device_name=args.device_name, device_id=0)
+
     if args.bbox is None:
-        bbox = [0, 0, img.shape[1], img.shape[0]]
+        result = detector(img)
     else:
-        # x, y, w, h -> left, top, right, bottom
+        # converter (x, y, w, h) -> (left, top, right, bottom)
+        print(args.bbox)
         bbox = np.array(args.bbox, dtype=int)
         bbox[2:] += bbox[:2]
-    bboxes.append(bbox)
-
-    detector = PoseDetector(args.model_path, args.device_name, 0)
-    result = detector([img], [bboxes])[0]
+        result = detector(img, bbox)
+    print(result)
 
     _, point_num, _ = result.shape
     points = result[:, :, :2].reshape(point_num, 2)
diff --git a/demo/python/rotated_object_detection.py b/demo/python/rotated_object_detection.py
index 3ac288cb4..4f02d5d1f 100644
--- a/demo/python/rotated_object_detection.py
+++ b/demo/python/rotated_object_detection.py
@@ -10,11 +10,10 @@ from mmdeploy_python import RotatedDetector
 def parse_args():
     parser = argparse.ArgumentParser(
         description='show how to use sdk python api')
+    parser.add_argument('device_name', help='name of device, cuda or cpu')
     parser.add_argument(
-        'model_path', help='the directory path of mmdeploy model')
-    parser.add_argument('image_path', help='the path of an image')
-    parser.add_argument(
-        '--device-name', default='cpu', help='the name of device, cuda or cpu')
+        'model_path', help='path of SDK model dumped by model converter')
+    parser.add_argument('image_path', help='path of an image')
     args = parser.parse_args()
     return args
 
@@ -23,9 +22,10 @@ def main():
     args = parse_args()
 
     img = cv2.imread(args.image_path)
-    detector = RotatedDetector(args.model_path, args.device_name, 0)
-    rbboxes, labels = detector([img])[0]
-    # print(rbboxes, labels)
+    detector = RotatedDetector(
+        model_path=args.model_path, device_name=args.device_name, device_id=0)
+    rbboxes, labels = detector(img)
+
     indices = [i for i in range(len(rbboxes))]
     for index, rbbox, label_id in zip(indices, rbboxes, labels):
         [cx, cy, w, h, angle], score = rbbox[0:5], rbbox[-1]