diff --git a/frameworks/intl/include/index_util.h b/frameworks/intl/include/index_util.h
index 5b80ddb837ff77e789daa41e86f6bb672edc8fd8..a769cb8206835a73e340e7573d61c3ab2f8bb8d6 100644
--- a/frameworks/intl/include/index_util.h
+++ b/frameworks/intl/include/index_util.h
@@ -31,7 +31,7 @@ public:
     std::string GetIndex(const std::string &String);
 
 private:
-    icu::AlphabeticIndex *index;
+    std::unique_ptr<icu::AlphabeticIndex> index;
 };
 }
 }
diff --git a/frameworks/intl/include/relative_time_format.h b/frameworks/intl/include/relative_time_format.h
index e10c0b3697fe25d293b51a0a8b17253b706d1533..eab567f516f0b713991c38ffec2cab7a11aa253e 100644
--- a/frameworks/intl/include/relative_time_format.h
+++ b/frameworks/intl/include/relative_time_format.h
@@ -59,8 +59,8 @@ private:
     std::string styleString = "long";
     std::string numeric = "always";
     std::string numberingSystem;
-    LocaleInfo *localeInfo = nullptr;
-    icu::RelativeDateTimeFormatter *relativeTimeFormat = nullptr;
+    std::unique_ptr<LocaleInfo> localeInfo;
+    std::unique_ptr<icu::RelativeDateTimeFormatter> relativeTimeFormat;
     UDateRelativeDateTimeFormatterStyle style = UDAT_STYLE_LONG;
     static std::unordered_map<std::string, URelativeDateTimeUnit> relativeUnits;
     static std::unordered_map<std::string, UDateRelativeDateTimeFormatterStyle> relativeFormatStyle;
diff --git a/frameworks/intl/src/date_time_format.cpp b/frameworks/intl/src/date_time_format.cpp
index 84eeda64ecdd34207a2dfac9c894a5e941a2aab2..5213df74adaacad7618648f46f3c3bfdd9b15a8f 100755
--- a/frameworks/intl/src/date_time_format.cpp
+++ b/frameworks/intl/src/date_time_format.cpp
@@ -179,7 +179,7 @@ void DateTimeFormat::removeAmPmChar()
         if (patternString[i] != 'a') {
             continue;
         }
-        if ((i + 1) < patternString.length() && patternString[i+1] == 't') {
+        if ((i + 1) < patternString.length() && patternString[i + 1] == 't') {
             continue;
         }
         if (i == 0) {
diff --git a/frameworks/intl/src/index_util.cpp b/frameworks/intl/src/index_util.cpp
index b603171ade1c4117290f4277cbe3e61953c50d88..7b2ed0394aa83eaeefaa1a707f02a9d1fdd74431 100644
--- a/frameworks/intl/src/index_util.cpp
+++ b/frameworks/intl/src/index_util.cpp
@@ -23,19 +23,15 @@ IndexUtil::IndexUtil(const std::string &localeTag)
     UErrorCode status = U_ZERO_ERROR;
     if (localeTag == "") {
         icu::Locale locale(LocaleConfig::GetSystemLocale().c_str());
-        index = new icu::AlphabeticIndex(locale, status);
+        index = std::make_unique<icu::AlphabeticIndex>(locale, status);
     } else {
         icu::Locale locale(localeTag.c_str());
-        index = new icu::AlphabeticIndex(locale, status);
+        index = std::make_unique<icu::AlphabeticIndex>(locale, status);
     }
 }
 
 IndexUtil::~IndexUtil()
 {
-    if (index != nullptr) {
-        delete index;
-        index = nullptr;
-    }
 }
 
 std::vector<std::string> IndexUtil::GetIndexList()
diff --git a/frameworks/intl/src/preferred_language.cpp b/frameworks/intl/src/preferred_language.cpp
index e69a1d1191597155fc73aba1602c2645031e7a8e..86b5eaf98a74339880c272412302de1cb4c1c307 100644
--- a/frameworks/intl/src/preferred_language.cpp
+++ b/frameworks/intl/src/preferred_language.cpp
@@ -39,12 +39,12 @@ bool PreferredLanguage::AddPreferredLanguageExist(std::vector<std::string> &pref
     }
     if (languageIdx < index) {
         for (int i = languageIdx; i < index; i++) {
-            preferredLanguageList[i] = preferredLanguageList[i+1];
+            preferredLanguageList[i] = preferredLanguageList[i + 1];
         }
     }
     if (languageIdx > index) {
         for (int i = languageIdx; i > index; i--) {
-            preferredLanguageList[i] = preferredLanguageList[i-1];
+            preferredLanguageList[i] = preferredLanguageList[i - 1];
         }
     }
     preferredLanguageList[index] = language;
@@ -173,7 +173,7 @@ std::vector<std::string> PreferredLanguage::GetPreferredLanguageList()
         list.insert(list.begin(), systemLanguage);
     } else {
         for (size_t i = (size_t)systemLanguageIdx; i > 0; i--) {
-            list[i] = list[i-1];
+            list[i] = list[i - 1];
         }
         list[0] = systemLanguage;
     }
diff --git a/frameworks/intl/src/relative_time_format.cpp b/frameworks/intl/src/relative_time_format.cpp
index 2fc79965d39ffa5392736beec89b0ebae1fe412f..e59b5737c7f9645f6a6ce1e0800da17f74e040a9 100644
--- a/frameworks/intl/src/relative_time_format.cpp
+++ b/frameworks/intl/src/relative_time_format.cpp
@@ -46,8 +46,8 @@ std::unordered_map<std::string, URelativeDateTimeUnit> RelativeTimeFormat::relat
     { "years", UDAT_REL_UNIT_YEAR },
 };
 
-RelativeTimeFormat::RelativeTimeFormat(const std::vector<std::string> &localeTags, std::map<std::string,
-    std::string> &configs)
+RelativeTimeFormat::RelativeTimeFormat(const std::vector<std::string> &localeTags,
+    std::map<std::string, std::string> &configs)
 {
     UErrorCode status = U_ZERO_ERROR;
     auto builder = std::make_unique<icu::LocaleBuilder>();
@@ -56,19 +56,19 @@ RelativeTimeFormat::RelativeTimeFormat(const std::vector<std::string> &localeTag
         std::string curLocale = localeTags[i];
         locale = builder->setLanguageTag(icu::StringPiece(curLocale)).build(status);
         if (LocaleInfo::allValidLocales.count(locale.getLanguage()) > 0) {
-            localeInfo = new LocaleInfo(curLocale, configs);
+            localeInfo = std::make_unique<LocaleInfo>(curLocale, configs);
             locale = localeInfo->GetLocale();
             localeBaseName = localeInfo->GetBaseName();
-            relativeTimeFormat = new icu::RelativeDateTimeFormatter(locale, nullptr, style,
+            relativeTimeFormat = std::make_unique<icu::RelativeDateTimeFormatter>(locale, nullptr, style,
                 UDISPCTX_CAPITALIZATION_NONE, status);
             break;
         }
     }
     if (localeInfo == nullptr || relativeTimeFormat == nullptr) {
-        localeInfo = new LocaleInfo(LocaleConfig::GetSystemLocale(), configs);
+        localeInfo = std::make_unique<LocaleInfo>(LocaleConfig::GetSystemLocale(), configs);
         locale = localeInfo->GetLocale();
         localeBaseName = localeInfo->GetBaseName();
-        relativeTimeFormat = new icu::RelativeDateTimeFormatter(locale, nullptr, style,
+        relativeTimeFormat = std::make_unique<icu::RelativeDateTimeFormatter>(locale, nullptr, style,
             UDISPCTX_CAPITALIZATION_NONE, status);
     }
     numberingSystem = localeInfo->GetNumberingSystem();
@@ -79,14 +79,6 @@ RelativeTimeFormat::RelativeTimeFormat(const std::vector<std::string> &localeTag
 
 RelativeTimeFormat::~RelativeTimeFormat()
 {
-    if (localeInfo != nullptr) {
-        delete localeInfo;
-        localeInfo = nullptr;
-    }
-    if (relativeTimeFormat != nullptr) {
-        delete relativeTimeFormat;
-        relativeTimeFormat = nullptr;
-    }
 }
 
 void RelativeTimeFormat::ParseConfigs(std::map<std::string, std::string> &configs)
diff --git a/interfaces/js/kits/src/i18n_addon.cpp b/interfaces/js/kits/src/i18n_addon.cpp
index ef9b6a1608db42b49732439086feae0924fd277f..c46ed11db527f77543dcd74f046dd25163b61e19 100644
--- a/interfaces/js/kits/src/i18n_addon.cpp
+++ b/interfaces/js/kits/src/i18n_addon.cpp
@@ -137,9 +137,9 @@ void I18nAddon::CreateInitProperties(napi_property_descriptor *properties)
     properties[19] = DECLARE_NAPI_FUNCTION("getPreferredLanguageList", GetPreferredLanguageList);
     // 20 is properties index
     properties[20] = DECLARE_NAPI_FUNCTION("getFirstPreferredLanguage", GetFirstPreferredLanguage);
-	// 21 is properties index
+    // 21 is properties index
     properties[21] = DECLARE_NAPI_FUNCTION("is24HourClock", Is24HourClock);
-	// 22 is properties index
+    // 22 is properties index
     properties[22] = DECLARE_NAPI_FUNCTION("set24HourClock", Set24HourClock);
 }
 
diff --git a/interfaces/native/innerkits/preferred_language/include/preferred_language.h b/interfaces/native/innerkits/preferred_language/include/preferred_language.h
index f43d2a6c0bcf23d4062d3f954ef94f6c24909fea..c6775fc001636ae861e5e69bb158a1c230f75bad 100644
--- a/interfaces/native/innerkits/preferred_language/include/preferred_language.h
+++ b/interfaces/native/innerkits/preferred_language/include/preferred_language.h
@@ -31,9 +31,9 @@ public:
     static std::string GetPreferredLocale();
 
 private:
-    static bool AddPreferredLanguageNonExist(std::vector<std::string> &preferredLanguageList, int index,
+    static bool AddPreferredLanguageNonExist(std::vector<std::string> &preferredLangList, int index,
                                              const std::string& language);
-    static bool AddPreferredLanguageExist(std::vector<std::string> &preferredLanguageList, int languageIdx, int index,
+    static bool AddPreferredLanguageExist(std::vector<std::string> &preferredLangList, int languageIdx, int index,
                                           const std::string& language);
     static std::set<std::string> GetResources();
     static bool IsMatched(const std::string& preferred, const std::string& resource);