diff --git a/src/index.js b/src/index.js
index 23d2a46..a936264 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,6 +4,167 @@
 import './plugin/index.js';
 import { systemInstance as system, emptyPlatform, Coordinate, Position, BlockType, Direction, Block } from 'norma-core';
 
+/*
+LiteXLoaderPromiseify begin, see <https://github.com/callstackexceed/LiteXLoaderPromiseify>.
+
+Copyright 2021 callstackexceed
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+(function () {
+    "use strict";
+    function promiseify(func, failReturnValue) {
+        return function(...args) {
+            let returnValue;
+            let promise = new Promise((reslove, reject) => {
+                returnValue = func.call(this, ...args, (...callbackArgs) => {
+                    reslove(callbackArgs);
+                });
+                if(returnValue === failReturnValue) {
+                    reject(new Error(`Failed when call ${func.name}`));
+                }
+            });
+            return {returnValue, promise};
+        }
+    }
+
+    LXL_Player.prototype.sendModalFormPromise = async function(...args) {
+        let {returnValue, promise} =
+            promiseify(LXL_Player.prototype.sendModalForm, undefined)
+            .call(this, ...args);
+        let callbackArgs = await promise;
+        return {
+            formId: returnValue,
+            player: callbackArgs[0],
+            id: callbackArgs[1]
+        }
+    }
+
+    LXL_Player.prototype.sendSimpleFormPromise = async function(...args) {
+        let {returnValue, promise} =
+            promiseify(LXL_Player.prototype.sendSimpleForm, undefined)
+            .call(this, ...args);
+        let callbackArgs = await promise;
+        return {
+            formId: returnValue,
+            player: callbackArgs[0],
+            id: callbackArgs[1]
+        }
+    }
+
+    LXL_Player.prototype.sendCustomFormPromise = async function(...args) {
+        let {returnValue, promise} =
+            promiseify(LXL_Player.prototype.sendCustomForm, undefined)
+            .call(this, ...args);
+        let callbackArgs = await promise;
+        return {
+            formId: returnValue,
+            player: callbackArgs[0],
+            data: callbackArgs[1]
+        }
+    }
+
+    LXL_Player.prototype.sendFormPromise = async function(...args) {
+        let {returnValue, promise} =
+            promiseify(LXL_Player.prototype.sendForm, undefined)
+            .call(this, ...args);
+        let callbackArgs = await promise;
+        if(typeof callbackArgs[1] === "number") {
+            return {
+                formId: returnValue,
+                player: callbackArgs[0],
+                id: callbackArgs[1]
+            }
+        } else {
+            return {
+                formId: returnValue,
+                player: callbackArgs[0],
+                data: callbackArgs[1]
+            }
+        }
+    }
+
+    network.httpGetPromise = async function(...args) {
+        let {returnValue, promise} =
+            promiseify(network.httpGet, false)
+            .call(this, ...args);
+        let callbackArgs = await promise;
+        return {
+            status: callbackArgs[0],
+            result: callbackArgs[1]
+        }
+    }
+
+    network.httpPostPromise = async function(...args) {
+        let {returnValue, promise} =
+            promiseify(network.httpPost, false)
+            .call(this, ...args);
+        let callbackArgs = await promise;
+        return {
+            status: callbackArgs[0],
+            result : callbackArgs[1]
+        }
+    }
+
+    function systemPromiseify(func, failReturnValue) {
+        return function(arg1, ...rest) {
+            let returnValue;
+            let promise = new Promise((reslove, reject) => {
+                returnValue = func.call(this, arg1, (...callbackArgs) => {
+                    reslove(callbackArgs);
+                }, ...rest);
+                if(returnValue === failReturnValue) {
+                    reject(new Error(`Failed when call ${func.name}`));
+                }
+            });
+            return {returnValue, promise};
+        }
+    }
+
+
+    system.cmdPromise = async function(...args) {
+        let {returnValue, promise} =
+            systemPromiseify(system.cmd, false)
+            .call(this, ...args);
+        let callbackArgs = await promise;
+        return {
+            exitcode: callbackArgs[0],
+            output: callbackArgs[1]
+        }
+    }
+
+    system.newProcessPromise = async function(...args) {
+        let {returnValue, promise} =
+            systemPromiseify(system.newProcess, false)
+            .call(this, ...args);
+        let callbackArgs = await promise;
+        return {
+            exitcode: callbackArgs[0],
+            output: callbackArgs[1]
+        }
+    }
+})();
+/*
+LiteXLoaderPromiseify end.
+*/
+
 // import { utils } from '../utils.js'
 const lastTimeOfPlayerRequest = new Map()
 
@@ -173,7 +334,8 @@ function handlePlayerRequest({ requestType, playerID, additionalData }) {
                     }
                 }
             });
-            player.sendForm(form, (player, data) => {
+            player.sendFormPromise(form).then((o) => {
+                let {player, data} = o;
                 if (!data) return
                 log(data)
                 data.forEach((e, i) => {
@@ -209,7 +371,8 @@ function handlePlayerRequest({ requestType, playerID, additionalData }) {
             let form = mc.newCustomForm()
             form.setTitle("Meta menu")
             form.addDropdown("Choose generator:", user.getGeneratorNames(), user.getGeneratorNames().findIndex((e) => e == user.getCurrentGeneratorName()))
-            player.sendForm(form, (player, data) => {
+            player.sendFormPromise(form).then((o) => {
+                let {player, data} = o;
                 if (!data) return
                 log(data)
                 user.switchGenerator(data[0])