Abstract: In order to improve the automatic testing level of maintainer and rapid test, fault detection for the unit of reactor protection assembly, this paper designs the reactor protection assembly checkout console. According to the method that pulse output circuit based on FPGA cooperates with fasting collection card sampling frequency and buffer data counting, the setpoint unit self-test interface test is conducted. The accurate mv signal simulation is realized according to the circuit of voltage feedback module and current feedback module. The fault locating of reactor protection assembly unit is realized also according to the fault locating expert system. After the testing and experimentation of Reactor Protection assembly checkout console, the result shows that the technical characters of Reactor Protection assembly checkout console satisfies the requirement of user.