diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6498ec5..153277d 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -19,11 +19,14 @@ add_library(Transmission
         CharBuff.cpp
         Exception/PrepareDataException.h
 )
-
-if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+if(NOT DEFINED TARGET_SYSTEM_NAME)
+    set(TARGET_SYSTEM_NAME ${CMAKE_SYSTEM_NAME})
+    message("使用默认目标 : ${TARGET_SYSTEM_NAME}")
+endif ()
+if (${TARGET_SYSTEM_NAME} STREQUAL "Linux")
     add_definitions(-DBUILD_LINUX=1)
     message("以Linux为构建目标")
-elseif (${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
+elseif (${TARGET_SYSTEM_NAME} STREQUAL "Windows")
     add_definitions(-DBUILD_WINDOWS=1)
     message("以Windows为构建目标")
 else ()