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On the automatic test equipment, according to the function demand for multicenter power control and the electrical test, a power controller unit was designed based on the DSP chip. Using a DSP chip as the collection and control unit, the hardware was designed by layered structure. And a communication circuit based on RS422 was designed. The software was compiled in both assemble language and C programming language, and a check mechanism was set for the code. It can be indicated from the experiment that the design has a good test precision, and it controls the switches correctly. Above all,the design solved the problem of engineering application,and the demand of real time and reliability can be completely met.