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The automatic calibration system for wind speed sensors developed by the Guangdong Provincial Atmosphere Observation and Technology Center is mainly used for calibrating windspeed sensors automatically equipped on the all types of automatic weather stations, which are used widely across China. The calibration system is highly automatic and easy to operate and control. An introduction is made to the design and development of the system and the realization of automatic control for the system, as well as the related hardware and software.