With the development of intelligent terminals and mobile internet, smart phones become more and more popular. Consequently, applications on them also become more and more diversified. Developers are facing a big problem of how to develop intelligent terminals' applications more quickly and efficiently. This essay analyzes and studies currently existing developments of cross-platform' hybrid application, based on which a hybrid applications' runtime on Android Platform is designed and implemented. Taking advantage of this runtime, developers can develop Android applications only via HTML, CSS, JavaScript. It brings much convinces to developers. This runtime environment is compatible with hybrid applications' runtime on desktop system. Applications developed via this runtime can be operated on desktop system after different screen adaptation.