The weapon control system's multi-signal model is structured and revised using TEAMS based on the testability analysis to solve the fault diagnosis and maintenance problem, which depends on the development manufacture at crews level and intermediate-level. The IETM theme framework of fault diagnosis and maintenance equipment is designed on AIM of Raytheon by the demand analysis of field maintenance. And the TEAMS diagnostic strategy is embedded and analyzed. Finally, the system hardware integration is developed according to user demands. It is shown by application that the equipment can locate failures, provide maintenance strategy and improve the support capability significantly at the crews level.