In order to meet the needs of information security and home-made mainframe,based on domestic CPLD chip,a circuit system which controls the power-on and power-off timing of the motherboard of domestic Phytium D2000 processor is designed and has the function of device detection.This system uses the CPLD product of the safety road company as the control chip,CPLD receives the CPU control signal,controls the state conversion of the system power supply,and then controls the power supply of each component of the motherboard,the system also includes the power supply circuit,clock circuit,equipment detection circuit and JTAG download debugging circuit.This system uses Verilog language to realize the control function of CPLD,and uses the special domestic EDA tool of safety road to carry on the follow-up synthesis and writing work.The experiment results show that the system can accurately control the power-on and power-off time sequence of each component of Phytium motherboard,and can realize the normal switch on and off and equipment detection function,which has certain practicability and popularization value.