The field calibration values of wind speed from automatic meteorological stations cannot be traced back, so that the accuracy and reliability of the field calibration data cannot be guaranteed. A investigate is conducted on the causes, which are determined by the current field calibration methods and the working principles of field calibration equipment. In order to solve this problem, the value transfer of wind speed sensors and the impeller wind meters are used to carry on the intermediate data transmission. In calibration, the impeller wind meter is used as the standard equipment. Using the linear characteristics of threecup type wind speed sensors, the field calibration values of wind speed sensors are traced to the largescale wind tunnel pitot tube, and through a great number of experiments, the validity of the method is proved, so as to solve this technical problem. The method provides a theoretical reference for making new specifications for the field calibration for wind speed from automatic meteorological stations and for perfecting of calibration equipment.