With current information technologies and Internet applications, the concept of regional mobile medical service network is proposed. Based upon the review of current researches on the mobile health service, cloud computing, and Android, the overall architecture of a mobile health service platform is presented, its key structure, including computing layer, medical service layer, and mobile application layer, is also discussed; Then, key technologies of the platform, including the principals of the Google App Engine, programming environments in client and server side, and data storage interface between GAE and the platform, are described in detail; Finally, the implementation of the platform is presented both from the mobile terminal and the server side perspectives, with a full demonstration of the client side functions based on Android, such as the display of medical expert information and medical supplies.