In the flight test,in order to solve the problems of SRIO protocol disconnection and poor transmission reliability in the storage process of high-speed and large capacity data,this paper puts forward the optimization design of the data storage system combining SRIO and RS422 with FPGA as the control core.The connection status flag of SRIO link is monitored in real-time and the link reconnection mechanism is added to realize the link recovery,which greatly increases the reliability of data storage.When the RS422 interface circuit is used to receive the telemetry control signal and status feedback,the serial port adds multiple sampling decision design to eliminate the external strong interference,which greatly improves the accuracy of the system to receive the telemetry command.After many tests,the optimized design can realize error-free status data feedback and accurate receiving of telemetry instructions,and improve the transmission reliability of SRIO link,so as to realize the reliable storage of high-speed and large-capacity optical fiber data.