diff --git a/contracts/GeneralizedFragment/impl/Fragment.sol b/contracts/GeneralizedFragment/impl/Fragment.sol
index 6fb629c..cf3e487 100644
--- a/contracts/GeneralizedFragment/impl/Fragment.sol
+++ b/contracts/GeneralizedFragment/impl/Fragment.sol
@@ -86,7 +86,8 @@ contract Fragment is InitializableERC20 {
       
       _BUYOUT_PRICE_ = IDVM(_DVM_).getMidPrice();
       uint256 requireQuote = DecimalMath.mulCeil(_BUYOUT_PRICE_, totalSupply);
-      require(IERC20(_QUOTE_).balanceOf(address(this)) >= requireQuote, "DODOFragment: QUOTE_NOT_ENOUGH");
+      uint256 payQuote = IERC20(_QUOTE_).balanceOf(address(this));
+      require(payQuote >= requireQuote, "DODOFragment: QUOTE_NOT_ENOUGH");
 
       IDVM(_DVM_).sellShares(
         IERC20(_DVM_).balanceOf(address(this)),
@@ -95,17 +96,14 @@ contract Fragment is InitializableERC20 {
         0,
         "",
         uint256(-1)
-      );  
+      ); 
 
+      uint256 redeemFrag = totalSupply.sub(balances[address(this)]).sub(balances[_VAULT_PRE_OWNER_]);
+      uint256 preOwnerQuote = payQuote.sub(DecimalMath.mulCeil(_BUYOUT_PRICE_, redeemFrag));
       _clearBalance(address(this));
-
-      uint256 preOwnerQuote = DecimalMath.mulFloor(_BUYOUT_PRICE_, balances[_VAULT_PRE_OWNER_]);
       _clearBalance(_VAULT_PRE_OWNER_);
-      IERC20(_QUOTE_).safeTransfer(_VAULT_PRE_OWNER_, preOwnerQuote);
 
-      uint256 newOwnerQuote = DecimalMath.mulFloor(_BUYOUT_PRICE_, balances[newVaultOwner]);
-      _clearBalance(newVaultOwner);
-      IERC20(_QUOTE_).safeTransfer(newVaultOwner, newOwnerQuote);
+      IERC20(_QUOTE_).safeTransfer(_VAULT_PRE_OWNER_, preOwnerQuote);
 
       ICollateralVault(_COLLATERAL_VAULT_).directTransferOwnership(newVaultOwner);
 
diff --git a/contracts/GeneralizedFragment/intf/IFragment.sol b/contracts/GeneralizedFragment/intf/IFragment.sol
index 995284f..b3caf40 100644
--- a/contracts/GeneralizedFragment/intf/IFragment.sol
+++ b/contracts/GeneralizedFragment/intf/IFragment.sol
@@ -24,4 +24,8 @@ interface IFragment {
     function redeem(address to) external;
 
     function _QUOTE_() external view returns (address);
+
+    function _DVM_() external view returns (address);
+
+    function totalSupply() external view returns (uint256);
 }
diff --git a/contracts/SmartRoute/proxies/DODONFTProxy.sol b/contracts/SmartRoute/proxies/DODONFTProxy.sol
index db9a840..0025145 100644
--- a/contracts/SmartRoute/proxies/DODONFTProxy.sol
+++ b/contracts/SmartRoute/proxies/DODONFTProxy.sol
@@ -60,6 +60,12 @@ contract DODONFTProxy is ReentrancyGuard, InitializableOwnable {
     event Buyout(address from, address fragment, uint256 amount);
     event Stake(address from, address feeDistributor, uint256 amount);
 
+    // ============ Modifiers ============
+
+    modifier judgeExpired(uint256 deadLine) {
+        require(deadLine >= block.timestamp, "DODONFTProxy: EXPIRED");
+        _;
+    }
 
     fallback() external payable {}
 
@@ -147,17 +153,28 @@ contract DODONFTProxy is ReentrancyGuard, InitializableOwnable {
 
     function buyout(
         address fragment,
-        uint256 quoteAmount,
-        uint8 flag // 0 - ERC20, 1 - quoteInETH
-    ) external payable preventReentrant {
-        if(flag == 1)
-            require(msg.value == quoteAmount, "DODONFTProxy: VALUE_INVALID");
-        else 
+        uint256 quoteMaxAmount,
+        uint8 flag, // 0 - ERC20, 1 - quoteInETH
+        uint256 deadLine
+    ) external payable preventReentrant judgeExpired(deadLine) {
+        if(flag == 0)
             require(msg.value == 0, "DODONFTProxy: WE_SAVED_YOUR_MONEY");
-            
-        _deposit(msg.sender, fragment, IFragment(fragment)._QUOTE_(), quoteAmount, flag == 1);
+        
+        address dvm = IFragment(fragment)._DVM_();
+        uint256 fragTotalSupply = IFragment(fragment).totalSupply();
+        uint256 buyPrice = IDVM(dvm).getMidPrice();
+
+        uint256 curRequireQuote = DecimalMath.mulCeil(buyPrice, fragTotalSupply);
+
+        require(curRequireQuote <= quoteMaxAmount, "DODONFTProxy: CURRENT_TOTAL_VAULE_MORE_THAN_QUOTEMAX");
+
+        _deposit(msg.sender, fragment, IFragment(fragment)._QUOTE_(), curRequireQuote, flag == 1);
         IFragment(fragment).buyout(msg.sender);
-        emit Buyout(msg.sender, fragment, quoteAmount);
+
+        // refund dust eth
+        if (flag == 1 && msg.value > curRequireQuote) msg.sender.transfer(msg.value - curRequireQuote);
+
+        emit Buyout(msg.sender, fragment, curRequireQuote);
     }
 
     function stakeToFeeDistributor(