diff --git a/interfaces/inner_api/dlp_parse/include/dlp_file_kits.h b/interfaces/inner_api/dlp_parse/include/dlp_file_kits.h
index 2eb4ca420d4a4ca365e5d95858dc8d8abd55d841..b88d75d86e8e2c125424712407ec048da31a895c 100644
--- a/interfaces/inner_api/dlp_parse/include/dlp_file_kits.h
+++ b/interfaces/inner_api/dlp_parse/include/dlp_file_kits.h
@@ -44,6 +44,7 @@ public:
     static bool IsDlpFile(int32_t dlpFd);
     static void ConvertAbilityInfoWithSupportDlp(const AAFwk::Want& want,
         std::vector<AppExecFwk::AbilityInfo> &abilityInfos);
+    static bool IsDlpFileBySuffix(const std::string &fileSuffix);
 };
 }  // namespace DlpPermission
 }  // namespace Security
diff --git a/interfaces/inner_api/dlp_parse/src/dlp_file_kits.cpp b/interfaces/inner_api/dlp_parse/src/dlp_file_kits.cpp
index 50461cc0825e714ec4f0017a9c86079b2c01b685..7ac677a491078b9193f7b709a2007fd61ac97272 100644
--- a/interfaces/inner_api/dlp_parse/src/dlp_file_kits.cpp
+++ b/interfaces/inner_api/dlp_parse/src/dlp_file_kits.cpp
@@ -78,7 +78,8 @@ static bool IsDlpFileName(const std::string& dlpFileName)
         return false;
     }
 
-    if (dlpFileName.substr(fileNameLen - dlpSuffixLen, dlpSuffixLen) != DLP_FILE_SUFFIX) {
+    std::string fileSuffix = dlpFileName.substr(fileNameLen - dlpSuffixLen, dlpSuffixLen);
+    if (DlpUtils::ToLowerString(fileSuffix) != DLP_FILE_SUFFIX) {
         return false;
     }
     return true;
@@ -281,6 +282,16 @@ void DlpFileKits::ConvertAbilityInfoWithSupportDlp(const AAFwk::Want &want,
         DLP_LOG_ERROR(LABEL, "Query ability info with bundleName error.");
     }
 }
+
+bool DlpFileKits::IsDlpFileBySuffix(const std::string &fileSuffix)
+{
+    std::string lowerFileSuffix = DlpUtils::ToLowerString(fileSuffix);
+    if (lowerFileSuffix != DLP_FILE_SUFFIX) {
+        DLP_LOG_DEBUG(LABEL, "%{public}s is not dlp file suffix", lowerFileSuffix.c_str());
+        return false;
+    }
+    return true;
+}
 }  // namespace DlpPermission
 }  // namespace Security
 }  // namespace OHOS