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Since the sensor technology is gradually mature, the diversity and variability of Internet of Things (IOT) applications are increasing. The interactions of users, application business and devices are also frequently. Aiming to the argument of complex interaction between information technology businesses and physic entities, proposing a model of Service-Oriented IOT application support system, abstracting the basic processes between practical application businesses and sensing devices through service mode, fusing middle-ware technology, building an application support system. The system achieved the mapping process between physical data and information data by services loosely-coupled, completed transparent interaction of practical application businesses and devices. Through enterprise development the system model has built and the system project has achieved. The system used in liquefied petroleum gas monitoring application experiment, reflecting the system eminent scalability and flexibility.