Abstract：Smart meter are getting more and more attention as an important terminal device of the electric power system, and its requirements of measurement accuracy and operation stability become more and more strict. So in the paper, according to the test requirements of electrical performance of GB/T 17215.321-2008 and Q/GDW 1364-2013 and Q/GDW 1827-2013, design an impact current testing system which can output 600~4500A current, that can test short overcurrent impacton direct meter.This paper first make a brief description of charge-discharge principles and control circuit principles of the testing system, and second the test results are given. The results show that the system can export 30Imax impact current to direct meter, and results error is in 0~-10%, the application time is half cycle of the rated frequency, that can meet the test requirements of the standards above.