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A kind of integrated maintenance system of IETM model is proposed for solving the problems of the field level equipment support in low testability weapon. It consists of a tablet computer, signal acquisition chassis, signal conditioning unit, and test cables,and it also has three kind of functions that include IETM, remote data terminal, and testing and maintenance equipment. The tablet computer has the complete functions, and transform fault component information to communication system of weapons. It also can be used with data acquired equipment and data process equipment, and the fault will be detected and concluded based on the diagnosis software. The software is developed based on Lab windows,Visio VBA and Access. The important problems of fault detection, diagnosis, failure tree auto generation were solved. At last step, the system was tested and verified in a kind of weapon control system, and all functions are useful. 