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Aiming at the problems of the large amount of data, geographically fragmented acquisition positions, high real-time performance demanding and a variety of data types in the process of data acquisition, we build a series-connection data acquisition system based on EtherCAT bus. The aspects of over-all structure, operating principle, master station software and hardware and software of slave station were introduced in detail. In order to verify the performance, we captured the height of wave in our lab. The experimental results indicate that the system has high reliability and real-time performance. The designed data acquisition system can provide references for the research of distributed data acquisition and control system.