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The Borehole Azimuth Acoustic Reflection Imaging Tool (BAR) is a new generation of imaging logging tool, and its logging data, which can’t be transmitted to ground for shortage of telecom rate, is stored in an internal mass storage module. In order to realize timely reading and replay logging data in field, a data reading interface based on USB bus is designed. The data reading interface communicates with the PC through the USB bus, and communicates with the downhole data storage module through a custom high-speed serial bus. The high-speed serial bus is a differential bus based on M-LVDS. The designed frequency of the bus is 80MHz and 8B/10B encoding is employed. The data reading interface uses FPGA as the main control chip, which implement the high speed bus protocol and transmission control. The data reading interface has tested in field, and the data reading rate reaches 57Mbps. The design realizes the fast reading and replay of logging data, which ensures the timeliness of logging data inspection and the efficiency of logging operation.