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Data acquisition technology has developed rapidly and has been widely used in different fields. The paper designs a circuit module for multi-channel data acquisition in the underwater part of sonar. In the overall design, the related technology principle of multi - channel data acquisition is introduced, and the overall design scheme of the acquisition module is designed. In the hardware circuit design, ADS1278 and BF537 are used as the analog - to - digital conversion chip and the master chip respectively. In the software design, the software design idea of the multi-channel data acquisition module is introduced, which mainly includes BF537-based data acquisition and processing program and Ethernet transmission program. Finally, the performance of the circuit module is tested. The results show that the performance of the multi-channel data acquisition module is excellent to meet the design requirements. The module has been applied in a sonar project, and can provide design reference for data acquisition engineering applications in other areas.