diff --git a/utils/src/b_json/b_json_entity_ext_manage.cpp b/utils/src/b_json/b_json_entity_ext_manage.cpp
index 758d2721e896c6a78b89f70f6e419c4cefaf1b16..d367ff3ffdd37f9bb69b0fa9ebe2bd7a2dbf3d0b 100644
--- a/utils/src/b_json/b_json_entity_ext_manage.cpp
+++ b/utils/src/b_json/b_json_entity_ext_manage.cpp
@@ -44,14 +44,26 @@ struct stat JsonValue2Stat(const Json::Value &value)
 {
     struct stat sta = {};
 
-    sta.st_size = value.isMember("st_size") ? value["st_size"].asInt64() : 0;
+    if (!value.isObject()) {
+        return sta;
+    }
+
+    sta.st_size = value.isMember("st_size") && value["st_size"].isInt64() ? value["st_size"].asInt64() : 0;
     if (value.isMember("st_atim")) {
-        sta.st_atim.tv_sec = value["st_atim"].isMember("tv_sec") ? value["st_atim"]["tv_sec"].asInt64() : 0;
-        sta.st_atim.tv_nsec = value["st_atim"].isMember("tv_nsec") ? value["st_atim"]["tv_nsec"].asInt64() : 0;
+        sta.st_atim.tv_sec = value["st_atim"].isMember("tv_sec") && value["st_atim"]["tv_sec"].isInt64()
+                                 ? value["st_atim"]["tv_sec"].asInt64()
+                                 : 0;
+        sta.st_atim.tv_nsec = value["st_atim"].isMember("tv_nsec") && value["st_atim"]["tv_nsec"].isInt64()
+                                  ? value["st_atim"]["tv_nsec"].asInt64()
+                                  : 0;
     }
     if (value.isMember("st_mtim")) {
-        sta.st_mtim.tv_sec = value["st_mtim"].isMember("tv_sec") ? value["st_mtim"]["tv_sec"].asInt64() : 0;
-        sta.st_mtim.tv_nsec = value["st_mtim"].isMember("tv_nsec") ? value["st_mtim"]["tv_nsec"].asInt64() : 0;
+        sta.st_mtim.tv_sec = value["st_mtim"].isMember("tv_sec") && value["st_mtim"]["tv_sec"].isInt64()
+                                 ? value["st_mtim"]["tv_sec"].asInt64()
+                                 : 0;
+        sta.st_mtim.tv_nsec = value["st_mtim"].isMember("tv_nsec") && value["st_mtim"]["tv_nsec"].isInt64()
+                                  ? value["st_mtim"]["tv_nsec"].asInt64()
+                                  : 0;
     }
 
     return sta;
@@ -120,7 +132,9 @@ set<string> BJsonEntityExtManage::GetExtManage() const
 
     set<string> info;
     for (Json::Value &item : obj_) {
-        string fileName = item.isMember("fileName") ? item["fileName"].asString() : "";
+        string fileName = item.isObject() && item.isMember("fileName") && item["fileName"].isString()
+                              ? item["fileName"].asString()
+                              : "";
         info.emplace(fileName);
     }
     return info;
@@ -139,21 +153,21 @@ map<string, pair<string, struct stat>> BJsonEntityExtManage::GetExtManageInfo()
 
     map<string, pair<string, struct stat>> info;
     for (const Json::Value &item : obj_) {
-        string fileName = item.isMember("fileName") ? item["fileName"].asString() : "";
-
-        if (!item.isMember("information")) {
+        if (!(item.isObject() && item.isMember("information"))) {
             continue;
         }
 
         struct stat sta = {};
-        string path = item["information"].isMember("path") ? item["information"]["path"].asString() : "";
+        string path = item["information"].isMember("path") && item["information"]["path"].isString()
+                          ? item["information"]["path"].asString()
+                          : "";
         if (path == BConstants::RESTORE_INSTALL_PATH) {
             throw BError(BError::Codes::UTILS_INVAL_JSON_ENTITY, "Failed to get ext manage info, invalid path");
         }
         if (item["information"].isMember("stat")) {
             sta = JsonValue2Stat(item["information"]["stat"]);
         }
-
+        string fileName = item.isMember("fileName") && item["fileName"].isString() ? item["fileName"].asString() : "";
         if (!fileName.empty() && !path.empty()) {
             info.emplace(fileName, make_pair(path, sta));
         }
@@ -178,7 +192,9 @@ bool BJsonEntityExtManage::SetHardLinkInfo(const string origin, const set<string
     }
 
     for (Json::Value &item : obj_) {
-        string fileName = item.isMember("fileName") ? item["fileName"].asString() : "";
+        string fileName = item.isObject() && item.isMember("fileName") && item["fileName"].isString()
+                              ? item["fileName"].asString()
+                              : "";
         if (origin == fileName) {
             for (const auto &lk : hardLinks) {
                 item["hardlinks"].append(lk);
@@ -207,12 +223,18 @@ const set<string> BJsonEntityExtManage::GetHardLinkInfo(const string origin)
 
     set<string> hardlinks;
     for (const Json::Value &item : obj_) {
-        string fileName = item.isMember("fileName") ? item["fileName"].asString() : "";
-        if (origin == fileName) {
-            if (!(item.isMember("hardlinks") && item["hardlinks"].isArray())) {
-                break;
-            }
-            for (const auto &lk : item["hardlinks"]) {
+        if (!item.isObject()) {
+            continue;
+        }
+        string fileName = item.isMember("fileName") && item["fileName"].isString() ? item["fileName"].asString() : "";
+        if (origin != fileName) {
+            continue;
+        }
+        if (!(item.isMember("hardlinks") && item["hardlinks"].isArray())) {
+            break;
+        }
+        for (const auto &lk : item["hardlinks"]) {
+            if (lk.isString()) {
                 hardlinks.emplace(lk.asString());
             }
         }