A zoom infrared imaging temperature measurement method is proposed in the context of a fixed mounted zoom temperature measurement thermal imaging camera suitable for use in extreme weather conditions,such as high winds and high temperatures,in order to address the temperature measurement problems of a continuous zoom thermal imaging camera.Based on the engineering temperature measurement method of fixed focus thermal imagers provided in the article,the focal length dimension is expanded to construct a polynomial model for temperature measurement of zoom thermal imagers,and the inversion parameters are calculated through optimization methods to obtain temperature measurement results at different focal lengths.Furthermore,a data calibration method for zoom temperature measurement is provided.A self developed zoom thermal imager is calibrated based on high precision blackbody data,and the temperature measurement accuracy at different focal lengths is analyzed.Observation experiments are conducted in both laboratory and outdoor environments.The experimental results show that high precision temperature measurement results can be obtained with different focal lengths,reaching the ±2℃ accuracy required by the national standard.This achievement can be promoted and applied to various types of zoom thermal imagers,improving the temperature measurement accuracy for long distance targets such as high voltage lines.