diff --git a/utils/include/color_parser.h b/utils/include/color_parser.h
index 32e87545d7382f428afec0f9793481fc6c18db9f..86bffb88c68c7a8a0146e8a1e5f834b82ce094cc 100644
--- a/utils/include/color_parser.h
+++ b/utils/include/color_parser.h
@@ -23,9 +23,6 @@ namespace Rosen {
 class ColorParser {
 public:
     static bool Parse(const std::string& colorStr, uint32_t& colorValue);
-
-private:
-    static bool IsValidHexString(const std::string& colorStr);
 };
 } // namespace Rosen
 } // namespace OHOS
diff --git a/utils/src/color_parser.cpp b/utils/src/color_parser.cpp
index ecd738f79d33c360f174553f7989837be544ec1e..710ae2790618f4d703080bf67b11f5f53c7b2f69 100644
--- a/utils/src/color_parser.cpp
+++ b/utils/src/color_parser.cpp
@@ -14,6 +14,7 @@
  */
 
 #include "color_parser.h"
+#include "string_ex.h"
 
 #include <cstdlib>
 
@@ -24,7 +25,6 @@ bool ColorParser::Parse(const std::string& colorStr, uint32_t& colorValue)
     if (colorStr.empty()) {
         return false;
     }
-
     if (colorStr[0] == '#') { // start with '#'
         std::string color = colorStr.substr(1);
         if (!IsValidHexString(color)) {
@@ -43,18 +43,5 @@ bool ColorParser::Parse(const std::string& colorStr, uint32_t& colorValue)
     return false;
 }
 
-bool ColorParser::IsValidHexString(const std::string& colorStr)
-{
-    if (colorStr.empty()) {
-        return false;
-    }
-    for (char ch : colorStr) {
-        if ((ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F')) {
-            continue;
-        }
-        return false;
-    }
-    return true;
-}
 } // namespace Rosen
 } // namespace OHOS