diff --git a/contracts/token/LockedTokenVault.sol b/contracts/token/LockedTokenVault.sol
index f79f6a1..682a158 100644
--- a/contracts/token/LockedTokenVault.sol
+++ b/contracts/token/LockedTokenVault.sol
@@ -31,8 +31,6 @@ contract LockedTokenVault is Ownable {
     mapping(address => uint256) internal originBalances;
     mapping(address => uint256) internal claimedBalances;
 
-    mapping(address => address) internal holderTransferRequest;
-
     uint256 public _UNDISTRIBUTED_AMOUNT_;
     uint256 public _START_RELEASE_TIME_;
     uint256 public _RELEASE_DURATION_;
@@ -42,13 +40,17 @@ contract LockedTokenVault is Ownable {
 
     // ============ Modifiers ============
 
+    event Claim(address indexed holder, uint256 origin, uint256 claimed, uint256 amount);
+
+    // ============ Modifiers ============
+
     modifier beforeStartRelease() {
         require(block.timestamp < _START_RELEASE_TIME_, "RELEASE START");
         _;
     }
 
     modifier afterStartRelease() {
-        require(block.timestamp > _START_RELEASE_TIME_, "RELEASE NOT START");
+        require(block.timestamp >= _START_RELEASE_TIME_, "RELEASE NOT START");
         _;
     }
 
@@ -94,6 +96,7 @@ contract LockedTokenVault is Ownable {
         require(holderList.length == amountList.length, "batch grant length not match");
         uint256 amount = 0;
         for (uint256 i = 0; i < holderList.length; ++i) {
+            // for saving gas, no event for grant
             originBalances[holderList[i]] = originBalances[holderList[i]].add(amountList[i]);
             amount = amount.add(amountList[i]);
         }
@@ -101,9 +104,11 @@ contract LockedTokenVault is Ownable {
     }
 
     function recall(address holder) external onlyOwner distributeNotFinished {
-        uint256 amount = originBalances[holder];
+        _UNDISTRIBUTED_AMOUNT_ = _UNDISTRIBUTED_AMOUNT_.add(originBalances[holder]).sub(
+            claimedBalances[holder]
+        );
         originBalances[holder] = 0;
-        _UNDISTRIBUTED_AMOUNT_ = _UNDISTRIBUTED_AMOUNT_.add(amount);
+        claimedBalances[holder] = 0;
     }
 
     // ============ For Holder ============
@@ -120,10 +125,20 @@ contract LockedTokenVault is Ownable {
         uint256 claimableToken = getClaimableBalance(msg.sender);
         _tokenTransferOut(msg.sender, claimableToken);
         claimedBalances[msg.sender] = claimedBalances[msg.sender].add(claimableToken);
+        emit Claim(
+            msg.sender,
+            originBalances[msg.sender],
+            claimedBalances[msg.sender],
+            claimableToken
+        );
     }
 
     // ============ View ============
 
+    function isReleaseStart() external view returns (bool) {
+        return block.timestamp >= _START_RELEASE_TIME_;
+    }
+
     function getOriginBalance(address holder) external view returns (uint256) {
         return originBalances[holder];
     }
@@ -132,29 +147,27 @@ contract LockedTokenVault is Ownable {
         return claimedBalances[holder];
     }
 
-    function getHolderTransferRequest(address holder) external view returns (address) {
-        return holderTransferRequest[holder];
-    }
-
     function getClaimableBalance(address holder) public view returns (uint256) {
-        if (block.timestamp < _START_RELEASE_TIME_) {
-            return 0;
-        }
         uint256 remainingToken = getRemainingBalance(holder);
         return originBalances[holder].sub(remainingToken).sub(claimedBalances[holder]);
     }
 
     function getRemainingBalance(address holder) public view returns (uint256) {
-        uint256 remainingToken = 0;
-        uint256 timePast = block.timestamp.sub(_START_RELEASE_TIME_);
+        uint256 remainingRatio = getRemainingRatio(block.timestamp);
+        return DecimalMath.mul(originBalances[holder], remainingRatio);
+    }
+
+    function getRemainingRatio(uint256 timestamp) public view returns (uint256) {
+        if (timestamp < _START_RELEASE_TIME_) {
+            return DecimalMath.ONE;
+        }
+        uint256 timePast = timestamp.sub(_START_RELEASE_TIME_);
         if (timePast < _RELEASE_DURATION_) {
             uint256 remainingTime = _RELEASE_DURATION_.sub(timePast);
-            remainingToken = originBalances[holder]
-                .sub(DecimalMath.mul(originBalances[holder], _CLIFF_RATE_))
-                .mul(remainingTime)
-                .div(_RELEASE_DURATION_);
+            return DecimalMath.ONE.sub(_CLIFF_RATE_).mul(remainingTime).div(_RELEASE_DURATION_);
+        } else {
+            return 0;
         }
-        return remainingToken;
     }
 
     // ============ Internal Helper ============
diff --git a/test/TokenLock.test.ts b/test/TokenLock.test.ts
index d678ebc..b82e52b 100644
--- a/test/TokenLock.test.ts
+++ b/test/TokenLock.test.ts
@@ -134,6 +134,10 @@ describe("Lock DODO Token", () => {
       assert.equal(await LockedTokenVault.methods.getClaimableBalance(u3).call(), "0")
       assert.ok(approxEqual(await LockedTokenVault.methods.getRemainingBalance(u3).call(), decimalStr("82.5")))
       assert.ok(approxEqual(await DODOToken.methods.balanceOf(u3).call(), decimalStr("93.75")))
+
+      // transfer from u3 to u1
+      await LockedTokenVault.methods.transferLockedToken(u1).send(ctx.sendParam(u3))
+
     })
 
     it("withdraw", async () => {