diff --git a/contracts/DODODrops/DODODropsV2/DODODrops.sol b/contracts/DODODrops/DODODropsV2/DODODrops.sol
index 5ef3e41..b000330 100644
--- a/contracts/DODODrops/DODODropsV2/DODODrops.sol
+++ b/contracts/DODODrops/DODODropsV2/DODODrops.sol
@@ -54,6 +54,8 @@ contract DODODrops is InitializableMintableERC20, ReentrancyGuard {
     uint256 public _REVEAL_RN_ = 0; 
     address public _RNG_;
 
+    bool public _CAN_TRANSFER_;
+
     fallback() external payable {}
 
     receive() external payable {}
@@ -65,6 +67,11 @@ contract DODODrops is InitializableMintableERC20, ReentrancyGuard {
         _;
     }
 
+    modifier canTransfer() {
+        require(_CAN_TRANSFER_, "DropsTickets: not allowed transfer");
+        _;
+    }
+
     // ============ Event =============
     event BuyTicket(address account, uint256 payAmount, uint256 feeAmount, uint256 ticketAmount);
     event RedeemPrize(address account, uint256 tokenId, address referer);
@@ -80,6 +87,8 @@ contract DODODrops is InitializableMintableERC20, ReentrancyGuard {
     event SetTokenIdMapByIndex(uint256 index); // only for ProbMode
     event SetFixedAmountInfo(); // only for FixedAmount mode
 
+    event SetCantransfer(bool allowed);
+
 
     function init(
         address[] memory addrList, //0 owner, 1 buyToken, 2 feeModel, 3 defaultMaintainer 4 rng 5 nftToken
@@ -217,7 +226,28 @@ contract DODODrops is InitializableMintableERC20, ReentrancyGuard {
         emit SetFixedAmountInfo();
     }
 
+
+    function approve(address spender, uint256 amount) canTransfer public override returns (bool) {
+        return super.approve(spender, amount);
+    }
+
+    function transferFrom(
+        address from,
+        address to,
+        uint256 amount
+    ) canTransfer public override returns (bool) {
+        return super.transferFrom(from, to, amount);
+    }
+
+    function transfer(address to, uint256 amount) canTransfer public override returns (bool) {
+        return super.transfer(to, amount);
+    }
+
     // ================= Owner ===================
+    function setCantransfer(bool allowed) public onlyOwner {
+        _CAN_TRANSFER_ = allowed;
+        emit SetCantransfer(allowed);
+    }
 
     function withdraw() external onlyOwner {
         uint256 amount = IERC20(_BUY_TOKEN_).universalBalanceOf(address(this));
@@ -227,6 +257,7 @@ contract DODODrops is InitializableMintableERC20, ReentrancyGuard {
 
     function setRevealRn() external onlyOwner {
         require(_REVEAL_RN_ == 0, "ALREADY_SET");
+        require(!_CAN_TRANSFER_, "NEED_CLOSE_TRANSFER");
         _REVEAL_RN_ = uint256(keccak256(abi.encodePacked(blockhash(block.number - 1))));
         emit SetReveal();
     }
diff --git a/contracts/external/ERC20/InitializableMintableERC20.sol b/contracts/external/ERC20/InitializableMintableERC20.sol
index 587c8ad..7199dea 100644
--- a/contracts/external/ERC20/InitializableMintableERC20.sol
+++ b/contracts/external/ERC20/InitializableMintableERC20.sol
@@ -42,7 +42,7 @@ contract InitializableMintableERC20 is InitializableOwnable {
         emit Transfer(address(0), _creator, _initSupply);
     }
 
-    function transfer(address to, uint256 amount) public returns (bool) {
+    function transfer(address to, uint256 amount) public virtual returns (bool) {
         require(to != address(0), "TO_ADDRESS_IS_EMPTY");
         require(amount <= balances[msg.sender], "BALANCE_NOT_ENOUGH");
 
@@ -60,7 +60,7 @@ contract InitializableMintableERC20 is InitializableOwnable {
         address from,
         address to,
         uint256 amount
-    ) public returns (bool) {
+    ) public virtual returns (bool) {
         require(to != address(0), "TO_ADDRESS_IS_EMPTY");
         require(amount <= balances[from], "BALANCE_NOT_ENOUGH");
         require(amount <= allowed[from][msg.sender], "ALLOWANCE_NOT_ENOUGH");
@@ -72,7 +72,7 @@ contract InitializableMintableERC20 is InitializableOwnable {
         return true;
     }
 
-    function approve(address spender, uint256 amount) public returns (bool) {
+    function approve(address spender, uint256 amount) public virtual returns (bool) {
         allowed[msg.sender][spender] = amount;
         emit Approval(msg.sender, spender, amount);
         return true;