Aiming at the requirement of a certain type of monitoring computer for dual-computer arbitration and event record, a control card with arbitration and event record functions is designed by using domestically produced CPLD SM2210 and domestically produced Flash memory SM25QH128. The mutual arbitration control of the 2 computers is realized by detecting the heartbeat signal of the CPU of the monitoring computer, the application signal for switching between the main and standby computers, and the power supply control signal; an intelligent flash continuous writing algorithm is designed by using the characteristics of the stored data to realize the automatic flash continuous writing function; CPU through the IIC interface, the query of the event is realized. The results show that the arbitration and event record card can realize the functions of arbitration and event record, and the performance is stable.