diff --git a/contracts/BEBase.sol b/contracts/BEBase.sol
index e9d89de..a243b9c 100644
--- a/contracts/BEBase.sol
+++ b/contracts/BEBase.sol
@@ -42,23 +42,7 @@ abstract contract BEBase is ERC721, AccessControlEnumerable, ERC721Enumerable, O
     }
 
     /**
-     * @dev See {IERC721-isApprovedForAll}.
-     */
-    function isApprovedForAll(address owner, address operator)
-        public
-        view
-        override
-        returns (bool)
-    {
-        if (approvalWhitelists[operator]) {
-            return true;
-        }
-
-        return super.isApprovedForAll(owner, operator);
-    }
-
-    /**
-     * @dev Allow operation to reduce gas fee.
+     * @dev Allow operation to approval list.
      */
     function addApprovalWhitelist(address proxy) external onlyOwner {
         require(!approvalWhitelists[proxy],  "Invalid proxy address");
@@ -161,6 +145,7 @@ abstract contract BEBase is ERC721, AccessControlEnumerable, ERC721Enumerable, O
             "Must have burn role to burn"
         );
         require(_exists(tokenId), "TokenId not exists");
+        require(!lockedTokens[tokenId], "Can not burn locked token");
         require(
             ownerOf(tokenId) == owner,
             "current address is not owner of this item now"