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diff --git a/doc/demo01_hello/hello.md b/doc/demo01_hello/hello.md
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 # 为什么选择godot
-- 比unity简单，更加易上手
-- 源代码开源，不收费，unity和ue都是要收费的
+
+- 比unity简单，更加易上手，GDScript学起来也比C#简单
+- 源代码开源，不收费，unity和ue都是要收费的，ue超过100万美元触发5%的分成费用
+  ![Image text](apache-license.png)
+  ![Image text](gd-home.JPG)
+
 - godot的源代码比cocos的源代码少一倍，简介的代码更容易学习底层原理
+
+```
+godot的作者尽最大努力的减少第三方库的依赖，最终使其代码非常精简，适合学习
+unity和ue安装后都得1g以上，godot下载包50m就搞定了，而且不用安装
+ue虽然开源源代码，但是代码量太大，历史包袱太重，不适合深入研究底层代码的人 
+```
+
 - 自己能够本地编译godot源代码，成就感爆棚
-- unity用多了，你会感觉自己就是个脚本小子。 
+- unity用多了，你会感觉自己就是个脚本小子
+
+```
+使用godot你既可以用GDScript去编写代码，也可以用C++去编写代码，还可以去改底层引擎代码
+大部分使用unity的都在和lua做斗争，虽然官方说用C#但是实际上工作用的大部分是lua，脚本中的脚本
+虽然unity可以把C#编译成二进制，但是使用这种方式也就意味着放弃了热更新
+```
+
 - 用godot你能感觉我能把控底层，我能把控每一行代码的底层细节
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