diff --git a/build_description.md b/build_description.md
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+#build ninja
+	
+#获取代码
+git clone https://gitee.com/openharmony/third_party_ninja.git
+	
+#通过python脚本构建生成二进制文件
+cd third_party_ninja
+./configure.py --bootstrap
+	
+#通过CMake编译生成二进制文件
+cd third_party_ninja
+cmake -Bbuild-cmake -H.
+cmake --build build-cmake