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In the progress of data types acquisition, as the geographically fragmented acquisition positions, high real-time performance demanding and complex industrial site, It is proposed a design of wave-height data gathering system based on WiFi. The system is mainly constructed of data acquisition unit,the main control unit, Wifi module and master station, wave-height data from AD converter will be stored into control circuit and outputted through WiFi module after processing by the master station.The PC in monitoring center receives wave-height data from wireless access point,after that,it will be displayed and analyzed by master station.In order to verify the performance,we capture the height of wave in out lab. The experimental results indicate that the system has real-time and reliable performance.