With the improvement of the automation level of radiosonde sounding and its precision, the sounding data have become more accurate. In order to improve the precision and integrity of wind finding data and solve the problems caused by error data or unsuitable computing methods, a method is proposed, in which the second wind finding data can be used to judge the wind direction, together with calculating quantity wind layer, and the slope distance is calculated by using interpolation technique to reduce the man made errors. Good results are obtained in the actual work, and the phenomena of data missing reduced significantly.