diff --git a/contracts/DODOToken/vDODOToken.sol b/contracts/DODOToken/vDODOToken.sol
index cda39df..ac2a95b 100644
--- a/contracts/DODOToken/vDODOToken.sol
+++ b/contracts/DODOToken/vDODOToken.sol
@@ -273,7 +273,11 @@ contract vDODOToken is InitializableOwnable {
     // ============ Helper Functions ============
 
     function getLatestAlpha() public view returns (uint256 newAlpha, uint256 curDistribution) {
-        curDistribution = _DODO_PER_BLOCK_ * (block.number - _LAST_REWARD_BLOCK_);
+        if (_LAST_REWARD_BLOCK_ == 0) {
+            curDistribution = 0;
+        } else {
+            curDistribution = _DODO_PER_BLOCK_ * (block.number - _LAST_REWARD_BLOCK_);
+        }
         if (_TOTAL_STAKING_POWER_ > 0) {
             newAlpha = uint256(alpha).add(DecimalMath.divFloor(curDistribution, _TOTAL_STAKING_POWER_));
         } else {
diff --git a/deploy-detail-periphery.txt b/deploy-detail-periphery.txt
index 307bedb..0dd0f64 100644
--- a/deploy-detail-periphery.txt
+++ b/deploy-detail-periphery.txt
@@ -53,3 +53,17 @@ network type: live
 Deploy time: 2021/2/9 下午11:22:45
 Deploy type: DODOMigrationBSC
 DODOMigrationBSCAddress:  0x02fCB21dc1cf221939C1d4277fB54016b5d32bC7
+====================================================
+network type: kovan
+Deploy time: 2021/2/13 下午12:25:51
+Deploy type: vDODOToken
+vDODOTokenAddress:  0x188A86C23c596C8b907b227C1DB34EfE769e5c0b
+Init vDODOTokenAddress Tx: 0x203c468d95005fe957e0ee22717b1a098a893be916dc18926de98f8d752832e3
+DODOCirculationHelperAddress:  0xbF5B98D74B249B86a2f1099D34CF568e2b5EB5b6
+Init DODOCirculationHelperAddress Tx: 0xfc46968cf93ff5324b70ca838e66ab5a4b95a2477a352f30e5e92f02d2cbce4a
+vDODOToken setDODOCirculationHelper tx:  0x47216bde498446ee2ed3e4e534c8814ad1e919e4c86f95d5ac619cbf1c1529aa
+DODOApproveProxy Unlock tx:  0xac285c252c052144c80722ca67b9e765280f2c45b8e4ff73282fabe26158aba6
+DODOApproveProxy add tx:  0x0a9174ac009af95a3273ad3a3a961e997aef48d5c3d2537e0389dd48619f1d06
+vDODOToken first mint tx:  0x600c5714df725a86725b36a01c3bf5cfc60853f02b7f7214ca9d80c98eb9e72d
+vDODOToken injected dodo tx:  0xf2415de9bafeef0d80afe990b5e36a0ebcd339d6cd604d6388fd72e4f01e0de7
+vDODOToken changeReward tx:  0x80c01b5e630acdccc2a96f97d884e207488ee64a18cdfcb4566820473ffe3a1f
diff --git a/deploy-detail-v2.0.txt b/deploy-detail-v2.0.txt
index 7077851..c4e64ca 100644
--- a/deploy-detail-v2.0.txt
+++ b/deploy-detail-v2.0.txt
@@ -640,3 +640,6 @@ Init DODOProxyV2 Tx: 0x72afdcd3795ee00b67b87c88af14227584b1ca7588dd10cdcda11c423
 DODOApproveProxy Init tx:  0x34e33c12750fff4abd34dd368157ad1b2101597f44a3f9783725d8a245860b73
 DODOApprove Init tx:  0x1f8ac1bbf54e3b42dc3657485fd837efba382a73342e2ced29b6e9fbdb4edeb4
 DODOIncentive ChangeProxy tx:  0xd0427f9a814efb822a36ebf17bbf637d066887adacf636c32455a165d30b768
+====================================================
+network type: kovan
+Deploy time: 2021/2/13 下午12:25:44
diff --git a/kovan-mock-v2.0.txt b/kovan-mock-v2.0.txt
index 8b5741b..5b22552 100644
--- a/kovan-mock-v2.0.txt
+++ b/kovan-mock-v2.0.txt
@@ -526,3 +526,6 @@ Deploy time: 2021/2/9 下午10:48:41
 ====================================================
 network type: kovan
 Deploy time: 2021/2/9 下午10:51:19
+====================================================
+network type: kovan
+Deploy time: 2021/2/13 下午12:25:48
diff --git a/migrations/5_deploy_periphery.js b/migrations/5_deploy_periphery.js
index d2fb7a5..7319edc 100644
--- a/migrations/5_deploy_periphery.js
+++ b/migrations/5_deploy_periphery.js
@@ -22,8 +22,8 @@ module.exports = async (deployer, network, accounts) => {
     if (network == "kovan") {
         DODOTokenAddress = "0x854b0f89BAa9101e49Bfb357A38071C9db5d0DFa";
         DODOApproveProxyAddress = "0xE2bf3e72E126f0AD4Aec07AdfA6cc345EEF43bDe";
-        DODOCirculationHelperAddress = "0xC4d70FdD0310BcAcA8a6eC85e66e95576CB096E4";
-        vDODOTokenAddress = "0x8e565B96C3B6BB36363183f5D43D667927164e91";
+        DODOCirculationHelperAddress = "";
+        vDODOTokenAddress = "";
         GovernanceAddress = "0x0000000000000000000000000000000000000000";
         //Account
         multiSigAddress = accounts[0];
@@ -97,8 +97,8 @@ module.exports = async (deployer, network, accounts) => {
         if(network == 'kovan') {
             const vDODOTokenInstance = await vDODOToken.at(vDODOTokenAddress);
             //updateDODOCirculationHelper
-            // var tx = await vDODOTokenInstance.updateDODOCirculationHelper(DODOCirculationHelperAddress);
-            // logger.log("vDODOToken setDODOCirculationHelper tx: ", tx.tx);
+            var tx = await vDODOTokenInstance.updateDODOCirculationHelper(DODOCirculationHelperAddress);
+            logger.log("vDODOToken setDODOCirculationHelper tx: ", tx.tx);
             
             //ApproveProxy add
             const DODOApproveProxyInstance = await DODOApproveProxy.at(DODOApproveProxyAddress);
diff --git a/truffle-config.js b/truffle-config.js
index 2615681..b6c7699 100644
--- a/truffle-config.js
+++ b/truffle-config.js
@@ -46,9 +46,9 @@ module.exports = {
     MOCK_V2_SWAP:     false,
     MANUAL_ADD_POOL:  false,
     MOCK_TARGET_POOL: false,
-    BSCMigration:     true,
+    BSCMigration:     false,
     DODOBscToken:     false,
-    vDODOToken:       false,
+    vDODOToken:       true,
     CALLEE:           false,
   },