diff --git a/contracts/MemberSystem/impl/MemPermission.sol b/contracts/MemberSystem/impl/MemPermission.sol
new file mode 100644
index 0000000..89288d6
--- /dev/null
+++ b/contracts/MemberSystem/impl/MemPermission.sol
@@ -0,0 +1,27 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+import {Ownable} from "../../lib/Ownable.sol";
+import {IPermissionManager} from "../../lib/PermissionManager.sol";
+import {IMemSource} from "./MemSourceStake.sol";
+
+contract MemPermission is Ownable {
+    uint256 public _MEM_LEVEL_THRESHOLD_;
+    address public _MEM_LEVEL_SOURCE_;
+
+    constructor(address memLevelSource, uint256 memLevelThreshold) public {
+        _MEM_LEVEL_THRESHOLD_ = memLevelThreshold;
+        _MEM_LEVEL_SOURCE_ = memLevelSource;
+    }
+
+    function isAllowed(address account) external returns (bool) {
+        return IMemSource(_MEM_LEVEL_SOURCE_).getMemLevel(account) >= _MEM_LEVEL_THRESHOLD_;
+    }
+}
diff --git a/contracts/MemberSystem/impl/MemSourceHold.sol b/contracts/MemberSystem/impl/MemSourceHold.sol
new file mode 100644
index 0000000..ef31c09
--- /dev/null
+++ b/contracts/MemberSystem/impl/MemSourceHold.sol
@@ -0,0 +1,27 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+import {Ownable} from "../../lib/Ownable.sol";
+import {IMemSource} from "./MemAggregator.sol";
+import {IERC20} from "../../intf/IERC20.sol";
+
+contract MemSourceHold is Ownable, IMemSource {
+    address public _DODO_TOKEN_;
+
+    constructor(address dodoToken) public {
+        _DODO_TOKEN_ = dodoToken;
+    }
+
+    // ============ View Function ============
+
+    function getMemLevel(address user) external override returns (uint256) {
+        return IERC20(_DODO_TOKEN_).balanceOf(user);
+    }
+}