diff --git a/contracts/staking/RewardDistributor.sol b/contracts/staking/RewardDistributor.sol
index adb0106..943ffb0 100644
--- a/contracts/staking/RewardDistributor.sol
+++ b/contracts/staking/RewardDistributor.sol
@@ -13,11 +13,8 @@ contract RewardDistributor is IRewardDistributor, ReentrancyGuard, Governable {
   using SafeERC20 for IERC20;
 
   address public override rewardToken;
-  // 1个token, 在指定周期内, 每秒可获得的收益
-  // 比如收益是150%, 周期是1年, 那么 1.5 / (365 * 24 * 3600)
   uint256 public override tokensPerInterval;
   uint256 public lastDistributionTime;
-  // RewardTracker合约地址
   address public rewardTracker;
 
   address public admin;
@@ -64,9 +61,7 @@ contract RewardDistributor is IRewardDistributor, ReentrancyGuard, Governable {
     uint256 timeDiff = block.timestamp - lastDistributionTime;
     return tokensPerInterval * timeDiff;
   }
-  // changed 
-  // 从RewardTracker合约中调用
-  // 由于我们是每个用户单独计算收益, 所以这里需要传入具体数量, 用于计算需要transafer的数量
+
   function distribute(uint256 _amount, uint256 _decimals) external override returns (uint256) {
     require(msg.sender == rewardTracker, "RewardDistributor: invalid msg.sender");
     uint256 amount = pendingRewards();
diff --git a/contracts/staking/RewardTracker.sol b/contracts/staking/RewardTracker.sol
index ac88c6a..a4d4e96 100644
--- a/contracts/staking/RewardTracker.sol
+++ b/contracts/staking/RewardTracker.sol
@@ -26,19 +26,14 @@ contract RewardTracker is IERC20, ReentrancyGuard, IRewardTracker, Governable {
 
   address public distributor;
   mapping(address token => bool status) public isDepositToken;
-  // 用户存入的token数量
   mapping(address account => mapping(address token => uint256 amount)) public override depositBalances;
-  // token总存入数量, 所有用户
   mapping(address token => uint256 amount) public totalDepositSupply;
   
   uint256 public cumulativeRewardPerToken;
-  // 用户stake的token数量
   mapping(address account => uint256 amount) public override stakedAmounts;
   mapping(address account => uint256 amount) public claimableReward;
   mapping(address account => uint256 amount) public previousCumulatedRewardPerToken;
-  // 用户累计收益
   mapping(address account => uint256 amount) public override cumulativeRewards;
-  // 平均
   mapping(address account => uint256 amount) public override averageStakedAmounts;
 
   bool public inPrivateTransferMode;
@@ -181,7 +176,6 @@ contract RewardTracker is IERC20, ReentrancyGuard, IRewardTracker, Governable {
       return claimableReward[_account];
     }
     uint256 pendingRewards = IRewardDistributor(distributor).pendingRewards() * PRECISION;
-    // 这里是pendingRewards是总的奖励，需要除以总的token数量, 我们是固定的比例的收益, 所以不需要再除以总数
     uint256 nextCumulativeRewardPerToken = cumulativeRewardPerToken + pendingRewards;
     return
       claimableReward[_account] +
diff --git a/contracts/staking/Vester.sol b/contracts/staking/Vester.sol
index 487dc0b..9c5b79b 100644
--- a/contracts/staking/Vester.sol
+++ b/contracts/staking/Vester.sol
@@ -28,14 +28,8 @@ contract Vester is IVester, IERC20, ReentrancyGuard, Governable {
 
   mapping(address account => uint256 amount) public balances;
   mapping(address account => uint256 amount) public override pairAmounts;
-  // 累积claim的数量, 每次计算后, 将可claim的数量从balances中转移到cumulativeClaimAmounts中, 
-  // 在claim和deposit时, 会更新cumulativeClaimAmounts
-  // 然后减去claimedAmounts, 就是可claim的数量
-  // claim以后, cumulativeClaimAmounts的值和claimedAmounts的值都会增加, 且相等
   mapping(address account => uint256 amount) public override cumulativeClaimAmounts;
-  // 已经claim了的数量, 只有在claim以后才会更新
   mapping(address account => uint256 amount) public override claimedAmounts;
-  // 最后claim的时间
   mapping(address account => uint256 time) public lastVestingTimes;
 
   mapping(address account => uint256 amount) public override cumulativeRewardDeductions;
@@ -266,7 +260,6 @@ contract Vester is IVester, IERC20, ReentrancyGuard, Governable {
   }
   /**
    * @dev Deposit ES tokens to the contract
-   * 将esToken transfer到合约, 更新cumulativeClaimAmounts, lastVestingTimes, balances
    */
   function _deposit(address _account, uint256 _amount) private {
     require(_amount > 0, "Vester: invalid _amount");
@@ -318,11 +311,8 @@ contract Vester is IVester, IERC20, ReentrancyGuard, Governable {
     if (balance == 0) {
       return 0;
     }
-    // vestedAmount = balance + cumulativeClaimAmount + 最后一次vesting 至今的可提取金额
     uint256 vestedAmount = getVestedAmount(_account);
     uint256 claimableAmount = (vestedAmount * timeDiff) / vestingDuration;
-    // 如果claimableAmount < balance, 返回claimableAmount
-    // 否则返回balance, 保证claimableAmount <= balance
     if (claimableAmount < balance) {
       return claimableAmount;
     }
diff --git a/contracts/staking/interfaces/IRewardDistributor.sol b/contracts/staking/interfaces/IRewardDistributor.sol
index e163553..d560210 100644
--- a/contracts/staking/interfaces/IRewardDistributor.sol
+++ b/contracts/staking/interfaces/IRewardDistributor.sol
@@ -5,6 +5,5 @@ interface IRewardDistributor {
   function rewardToken() external view returns (address);
   function tokensPerInterval() external view returns (uint256);
   function pendingRewards() external view returns (uint256);
-  // changed 
   function distribute(uint256 _amount, uint256 _decimals) external returns (uint256);
 }