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The design of time series controller circuit is described in detail in this paper.A3P250 series FPGA of Microsemi company is adoped as the controller,time series controller with high reliability is designed.Based on reliability,the design scheme is introduced from the aspects of structure,hardware and software design.The time series controller adopts the safety design measures in the hardware circuit design,in time series test,the ignition circuit of the plant can be short connect and in the resistance test of initiating explosive devices,the ignition circuit can be disconnected to ensure the absolute safety of the initiating explosive devices.In the software design,the FPGA arbitration mechanism is adopted,and the corresponding functions can be completed only according to the predetermined test process and the specific logical order.Gray code counter is used in the design of timer,which can effectively avoid the metastability phenomenon caused by register overturning of counter. The time series controller has participated in many flight test of the rocket and has considerable stability and reliability.