Wind, rain, thunder and lightning is harmful to the transmission line, wind is the most frequent and longer influence on the line. The research of wind influenced on the transmission line is useful to vibration protection, so it’s very important to monitor the wind speed on the transmission line. The two experimental lines were taken as examples in this paper, according to the theory of Karman vortex, around the cylinder has been powered by the wind produced the alternating periodic force, the force is a transient stability of power makes the transient stability vibration frequency of transmission line, find the relationship between the vibration frequency and wind speed, and then compared the fitted wind speed with the micro meteorological wind speed. The result show that the strangest vibration frequency can reflect the change of wind speed on the transmission line better over time, this method provide certain practical value for the study of the vibration on the transmission line.