1. A conversion method of applications of mobile devices, comprising: obtaining a device feature information and a platform information of a mobile device; and modifying, by a convertor, a first description data of a first application according to the obtained device feature information and platform information and converting the modified first application to a second application, wherein the first application is represented by a platform-neutral language and at least includes the first description data describing the interaction design of a user interface, and the second application is represented by a language corresponding to the platform information and can be executed to generate the user interface on the mobile device.