不能用urlencode转化中文

为啥我这边用urlencode转化之后的中文是一串%C9%FA%B4%E6%BC%BC%C4%DC这样的，没有转化的中文显示null？ {"button":[{"type":"click","name":"%C9%FA%B4%E6%BC%BC%C4%DC","key":"item1"},{"name":null,"sub_button":{"type":"click","name":null,"key":"item2"}},{"type":"click","name":null,"key":"item3"}]}