Abstract: Through analysis on the influence of high temperature on the performance of ultrasonic transducers, measures to optimize the selection of wedge and piezoelectric material, as well as the assembly process are proposed to improve the high temperature performance of ultrasonic transducers. The wedge material with slow change of sound Velocity-Temperature and the parameter design according to the velocity of operating temperature are selected to reduce the influence of temperature on transducers angle and position. The piezoelectric material with Curie temperature greater than operating temperature and epoxy with higher glass transition temperature are selected as composite piezoelectric fillers. In order to improve the sensitivity and stability of the transducers in high temperature environment, the probe assembly uses high temperature bonding glue and gradient temperature curing process to improve its service life in high temperature environment. A batch of high-temperature probe performance tests was performed to verify the above analysis results.