diff --git a/contracts/MarketPlace.sol b/contracts/MarketPlace.sol
index fa94a97..f22d90d 100644
--- a/contracts/MarketPlace.sol
+++ b/contracts/MarketPlace.sol
@@ -22,6 +22,9 @@ contract Marketplace is Ownable, HasSignature {
     address public feeToAddress;
     uint256 public transactionFee;
 
+    uint256 private constant minTransactionFee = 50
+    uint256 private constant maxTransactionFee = 1000
+
     // Events
     event MatchTransaction(
         uint256 indexed tokenId,
@@ -39,6 +42,10 @@ contract Marketplace is Ownable, HasSignature {
     }
 
     function setTransactionFee(uint256 _transactionFee) external onlyOwner {
+        require(
+            _transactionFee >= minTransactionFee && _transactionFee <= maxTransactionFee,
+            "Marketplace: _transactionFee must >= 50 and <= 1000"
+            )
         transactionFee = _transactionFee;
     }