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In order to reduce the size, weight and power consumption of general data acquisition system, the multi-channel ADC chip ADS8638 with high sampling rate and small size made in Texas Instrument is selected to design the data acquisition system based on FPGA, which controls the ADC to sample and convert analog signals into digital ones. The interface circuit between FPGA and the chip, as well as the control software which is programmed using verilog HDL is designed. Through software simulation, static timing analysis, the correctness and stability of the software design is verified. Finally, the hardware system test results indicate that the scheme is reasonable and reliable, can greatly reduce the system size and power consumption compared with the common data acquisition system, and is of good practical value. 