diff --git a/mmocr/models/textrecog/encoders/channel_reduction_encoder.py b/mmocr/models/textrecog/encoders/channel_reduction_encoder.py
index 790c57f2..0f6797d1 100644
--- a/mmocr/models/textrecog/encoders/channel_reduction_encoder.py
+++ b/mmocr/models/textrecog/encoders/channel_reduction_encoder.py
@@ -1,6 +1,10 @@
 # Copyright (c) OpenMMLab. All rights reserved.
+from typing import Dict, Optional, Sequence
+
+import torch
 import torch.nn as nn
 
+from mmocr.core.data_structures import TextRecogDataSample
 from mmocr.registry import MODELS
 from .base_encoder import BaseEncoder
 
@@ -13,23 +17,32 @@ class ChannelReductionEncoder(BaseEncoder):
         in_channels (int): Number of input channels.
         out_channels (int): Number of output channels.
         init_cfg (dict or list[dict], optional): Initialization configs.
+            Defaults to dict(type='Xavier', layer='Conv2d').
     """
 
-    def __init__(self,
-                 in_channels,
-                 out_channels,
-                 init_cfg=dict(type='Xavier', layer='Conv2d')):
+    def __init__(
+        self,
+        in_channels: int,
+        out_channels: int,
+        init_cfg: Dict = dict(type='Xavier', layer='Conv2d')
+    ) -> None:
         super().__init__(init_cfg=init_cfg)
 
         self.layer = nn.Conv2d(
             in_channels, out_channels, kernel_size=1, stride=1, padding=0)
 
-    def forward(self, feat, img_metas=None):
+    def forward(
+        self,
+        feat: torch.Tensor,
+        data_samples: Optional[Sequence[TextRecogDataSample]] = None
+    ) -> torch.Tensor:
         """
         Args:
             feat (Tensor): Image features with the shape of
                 :math:`(N, C_{in}, H, W)`.
-            img_metas (None): Unused.
+            data_samples (list[TextRecogDataSample], optional): Batch of
+                TextRecogDataSample, containing valid_ratio information.
+                Defaults to None.
 
         Returns:
             Tensor: A tensor of shape :math:`(N, C_{out}, H, W)`.
diff --git a/tests/test_models/test_textrecog/test_encoders/test_channel_reduction_encoder.py b/tests/test_models/test_textrecog/test_encoders/test_channel_reduction_encoder.py
new file mode 100644
index 00000000..dd1fa5e8
--- /dev/null
+++ b/tests/test_models/test_textrecog/test_encoders/test_channel_reduction_encoder.py
@@ -0,0 +1,26 @@
+# Copyright (c) OpenMMLab. All rights reserved.
+import unittest
+
+import torch
+
+from mmocr.core.data_structures import TextRecogDataSample
+from mmocr.models.textrecog.encoders import ChannelReductionEncoder
+
+
+class TestChannelReductionEncoder(unittest.TestCase):
+
+    def setUp(self):
+        self.feat = torch.randn(2, 512, 8, 25)
+        gt_text_sample1 = TextRecogDataSample()
+        gt_text_sample1.set_metainfo(dict(valid_ratio=0.9))
+
+        gt_text_sample2 = TextRecogDataSample()
+        gt_text_sample2.set_metainfo(dict(valid_ratio=1.0))
+
+        self.data_info = [gt_text_sample1, gt_text_sample2]
+
+    def test_encoder(self):
+        encoder = ChannelReductionEncoder(512, 256)
+        encoder.train()
+        out_enc = encoder(self.feat, self.data_info)
+        self.assertEqual(out_enc.shape, torch.Size([2, 256, 8, 25]))