diff --git a/contracts/pst_bridge.sol b/contracts/pst_bridge.sol
new file mode 100644
index 0000000..937c13b
--- /dev/null
+++ b/contracts/pst_bridge.sol
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "./gwt.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+contract PSTBridge is Ownable {
+    GWT public gwt;
+
+    // PST到GWT的兑换
+    mapping(bytes32 => uint256) public pst_to_gwt;
+
+    constructor(address _gwt) Ownable(msg.sender) {
+        gwt = GWT(_gwt);
+    }
+
+    function getClaimableGWT(string calldata cookie) public view returns (uint256) {
+        return pst_to_gwt[keccak256(abi.encodePacked(msg.sender, cookie))];
+    }
+
+    function registerPST(address[] calldata recvAddress, string[] calldata cookie, uint256[] calldata pstAmount) onlyOwner public {
+        for (uint i = 0; i < recvAddress.length; i++) {
+            pst_to_gwt[keccak256(abi.encodePacked(recvAddress[i], cookie[i]))] = pstAmount[i] / 210;
+        }
+    }
+
+    function claimGWT(string calldata cookie) public {
+        bytes32 key = keccak256(abi.encodePacked(msg.sender, cookie));
+        require(pst_to_gwt[key] > 0, "no dmc1 amount");
+        uint256 gwtAmount = pst_to_gwt[key];
+        pst_to_gwt[key] = 0;
+        
+        gwt.mint(msg.sender, gwtAmount);
+    }
+}
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