The launch of Apple iPhone brings the success of App Store application platform, which turns the structure of mobile software industry as well as creating a brand new application business model. It changes not only environment of mobile industry and supply chains, but also the using behaviors of mobile phone users. This research applies wildscale biobligraphy analysis, case study and Delphi method, trying to analyze the market status, business model of application platform. Using 2-phase interviews with smart phone users, developers, and operator, and SWOT and Porter¡¦s Five Force Analysis model to study the business model and strategies for operator¡¦s application platform. The research discovers that telecommunication operator has serveral advantages, such as holding huge user base and payment safety; however, economic scope and service efficiency is the key to the success. Operator should use its strengths and cope with the changing user behavior to create more added value.