diff --git a/README.md b/README.md
index 0e23518..251fc58 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,20 @@ A pytorch implementation of the "Selective Convolutional Descriptor Aggregation"
 [largestConnectComponent](https://blog.csdn.net/xuyangcao123/article/details/81023732)
 
 ## Details
+install requirements
+
+
+```
+  pip install -r requirements.txt;
+```
+
 On CUB and split dataset in 'CUB_200.py'.
 
 random split CUB-200-2011 results:
 ||top1|top5
 ---|:--:|---:
 CUB|-|-
+
+
+
+>Wei X S , Luo J H , Wu J , et al. Selective Convolutional Descriptor Aggregation for Fine-Grained Image Retrieval[J]. IEEE Transactions on Image Processing, 2017, 26(6):2868-2881.
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..0a1d203
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,7 @@
+scipy==1.3.1
+scikit_image==0.16.2
+torchvision==0.4.2
+numpy==1.17.3
+torch==1.3.1
+Pillow==7.1.2
+skimage==0.0