The mechanical model of a new spring locking mechanism was established. The optimum spring parameters of the locking mechanism which meet the design requirements were provided by optimization. Using the finite element method, numerical simulation of working process of the locking mechanism was carried out. The rationality of optimization result was verified by simulation results of numerical simulation.

By analyzing the current problems in equipment automatic test system, we describe the concept, the basic working principle and advantages of service-oriented architecture (SOA), then introduce the web service architecture and the standards of establishing service-oriented architecture. The architecture model of automatic test system on SOA-based equipment was designed, and was used to realize the unified description of equipment automatic test (including fault diagnosis) information. This effectively improves the equipment's capability in performance detection and maintenance support.