diff --git a/README.md b/README.md
index ed4c6c4..7eb8137 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,33 @@
 python_example
 ==============
 
+c++ direct call from python
+
+
+cuda call from python 
+-----------
+compile the cuda code
+```
+nvcc -m64 -arch=sm_75 -o  addgpu.dll -Xcompiler "/LD /D_USRDLL /D_WINDLL" add.cu
+```
+
+> https://zhuanlan.zhihu.com/p/646734746
+> https://cloud.tencent.com/developer/article/1944944  
+> https://github.com/PWhiddy/pybind11-cuda
+
+thrid-party library call from python
+-----------
+> https://zhuanlan.zhihu.com/p/110465274
+
+
+torch extension call from python
+-----------
+https://godweiyang.com/2021/03/18/torch-cpp-cuda/
+
+c++ direct call from C++
+
+
+
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