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During the test of Underwater vehicle, we need to record various operating parameters、trajectory in real-time, the record data have to be transmitted to the data terminal processing equipment for analysis and processing. Because of the large amount of data recorded in vehicle’s long running, in the processing of data extraction, the traditional RS232 transmission method is very slow, even though with the CAN bus, it also spends a lot of time, seriously affecting the efficiency of the test. Through systematic analysis,the design uses FPGA to achieve a USB high-speed transmission of data extraction, can greatly improve efficiency of the vehicle’s data extraction , and has great value in vehicle engineering design.