diff --git a/cmake/external/ascend.cmake b/cmake/external/ascend.cmake
index 03bc7784e9288d7125d9b9949c0793a1b1f9fcb0..5029878af6199b505c76b3ed3593cf0bd7adf615 100644
--- a/cmake/external/ascend.cmake
+++ b/cmake/external/ascend.cmake
@@ -90,9 +90,9 @@ endif()
 if (WITH_ASCEND_CL)
 macro(find_ascend_toolkit_version ascend_toolkit_version_info) 
     file(READ ${ascend_toolkit_version_info} ASCEND_TOOLKIT_VERSION_CONTENTS)
-    string(REGEX MATCH "version=([0-9]+\.[0-9]+\.[0-9]+\.[a-z]*[0-9]*)" ASCEND_TOOLKIT_VERSION "${ASCEND_TOOLKIT_VERSION_CONTENTS}")
-    string(REGEX REPLACE "version=([0-9]+\.[0-9]+\.[0-9]+\.[a-z]*[0-9]*)" "\\1" ASCEND_TOOLKIT_VERSION "${ASCEND_TOOLKIT_VERSION}")
-    string(REGEX REPLACE "[a-z|\.]" "" CANN_VERSION ${ASCEND_TOOLKIT_VERSION})
+    string(REGEX MATCH "version=([0-9]+\.[0-9]+\.(RC)?[0-9]+\.[a-z]*[0-9]*)" ASCEND_TOOLKIT_VERSION "${ASCEND_TOOLKIT_VERSION_CONTENTS}")
+    string(REGEX REPLACE "version=([0-9]+\.[0-9]+\.(RC)?[0-9]+\.[a-z]*[0-9]*)" "\\1" ASCEND_TOOLKIT_VERSION "${ASCEND_TOOLKIT_VERSION}")
+    string(REGEX REPLACE "[A-Z]|[a-z|\.]" "" CANN_VERSION ${ASCEND_TOOLKIT_VERSION})
     add_definitions("-DCANN_VERSION_CODE=${CANN_VERSION}")
     if(NOT ASCEND_TOOLKIT_VERSION)
         set(ASCEND_TOOLKIT_VERSION "???")