Abstract: With the development of 4G wireless network,the client mability of traditional B/S application mode becomes an unavoidable trend.Since the mobile terminals in the market are complex and diversified,the development mode of Hybrid App makes it possible for cross-platform portability in mobile applications.Based on the development platform of PhoneGap and the frame of jqMobi,the paper will analyze the implementation principle of PhoneGap cross-platform,and elaborate the application of plug-in by illustrating the realization of functions of camera,weather,and location system.It will propose solutions to deal with the problem that the json data cannot be read and that the map location is inaccurate.