Abstract: To evaluate the wind-induced vibration characteristics and wind vibration coefficient of transmission tower under thunderstorm, a wind tunnel test of aeroelastic tower model is conducted under steady thunderstorm field generated by blade-system in the boundary layer wind tunnel. Moreover, the difference in structural response between the thunderstorm field and B category is examined. The results indicate that the variation of displacement, stress and acceleration responses with wind speed and wind direction in thunderstorm field are similar to that in B category. The mean and fluctuation responses of tower under thunderstorm field are generally higher than those in B category, and the response increases more significantly when the maximum wind speed of thunderstorm field is at the tower top. The along-wind mean and fluctuating values as well as lateral fluctuating values for displacement at the top of tower can be up to 1.58 times, 1.44 times and 1.87 times of the response under B category. The mean and fluctuating stresses at the tower legs can reach 1.61 and 1.21 times, and the fluctuating acceleration at the middle cross arm can reach up to 1.38 times. The wind vibration coefficient of displacement and stress under thunderstorm field is generally lower than that of B category, while the factor of acceleration is basically the same as that of B category. The displacement wind vibration coefficient of the tower top under thunderstorm field is about 92% of the value under B category, and the factor of tensile and compressive stresses at the tower legs are about 93% and 90% of the value under B category, respectively. The results are valuable for the design of tower against thunderstorm wind.