diff --git a/services/bundlemgr_lite/src/bundle_util.cpp b/services/bundlemgr_lite/src/bundle_util.cpp
index 745816180b3f29306e264befbd96437a8059a4a2..00afe2434f53f5f4905e1dc26ad877add965e44b 100755
--- a/services/bundlemgr_lite/src/bundle_util.cpp
+++ b/services/bundlemgr_lite/src/bundle_util.cpp
@@ -494,6 +494,18 @@ cJSON *BundleUtil::ConvertInstallRecordToJson(const InstallRecord &installRecord
     return root;
 }
 
+int CreateRand(void)
+{
+    int fd;
+    int r = 0;
+    fd = open("/dev/random", O_RDONLY);
+    if (fd > 0) {
+        read(fd, &r, sizeof(int));
+    }
+    close(fd);
+    return r;
+}
+
 void BundleUtil::CreateRandStr(char *str, uint32_t len)
 {
     if (str == nullptr) {
@@ -504,11 +516,12 @@ void BundleUtil::CreateRandStr(char *str, uint32_t len)
 #else
     srand(LOS_TickCountGet());
 #endif
+ 
     uint32_t i;
     for (i = 0; i < len - 1; ++i) {
         switch ((rand() % NUM_OF_TYPE)) {
             case 0:
-                str[i] = 'A' + rand() % MAX_CHARACTER_VALUE;
+                str[i] = 'A' + CreateRand() % MAX_CHARACTER_VALUE;
                 break;
             case 1:
                 str[i] = 'a' + rand() % MAX_CHARACTER_VALUE;