diff --git a/deps/oblib/src/lib/oblog/ob_log_print_kv.h b/deps/oblib/src/lib/oblog/ob_log_print_kv.h
index 2e6247a8a0..b606e246e2 100644
--- a/deps/oblib/src/lib/oblog/ob_log_print_kv.h
+++ b/deps/oblib/src/lib/oblog/ob_log_print_kv.h
@@ -90,6 +90,28 @@ private:
   const char *str_;
 };
 
+class ObQuoteSzString
+{
+public:
+  explicit ObQuoteSzString(const char *s) : str_(s)
+  {}
+  ~ObQuoteSzString()
+  {}
+
+  int64_t to_string(char *buf, const int64_t len) const
+  {
+    int64_t pos = 0;
+    if (OB_ISNULL(str_)) {
+      (void)logdata_printf(buf, len, pos, "NULL");
+    } else {
+      (void)logdata_printf(buf, len, pos, "\"%s\"", str_);
+    }
+    return pos;
+  }
+private:
+  const char *str_;
+};
+
 /**
  * used to print string that maybe not terminated by zero and has a max lenght
  */
diff --git a/src/share/backup/ob_backup_struct.cpp b/src/share/backup/ob_backup_struct.cpp
index 935b3207f9..9ba2710f9d 100755
--- a/src/share/backup/ob_backup_struct.cpp
+++ b/src/share/backup/ob_backup_struct.cpp
@@ -4088,7 +4088,7 @@ int64_t ObBackupSetFileDesc::to_string(char *min_restore_scn_str_buf, char *buf,
     // do nothing
   } else {
     J_OBJ_START();
-    ObSzString min_restore_scn_display(min_restore_scn_str_buf);
+    ObQuoteSzString min_restore_scn_display(min_restore_scn_str_buf);
     J_KV(K_(backup_set_id), K_(incarnation), K_(tenant_id), K_(dest_id), K_(backup_type), K_(plus_archivelog),
       K_(date), K_(prev_full_backup_set_id), K_(prev_inc_backup_set_id), K_(stats), K_(start_time), K_(end_time),
       K_(status), K_(result), K_(encryption_mode), K_(passwd), K_(file_status), K_(backup_path), K_(start_replay_scn),