The transmitter is a key part of the radar system, and its failure rate accounts for about 50% of the failure rate of the radar system, while the ignition failure of the transmitter accounts for more than 85% of the failure rate of the transmitter. Therefore, the level of transmitter failure rate directly affects the reliability of the radar system. Aiming at the ignition failure of a certain type of radar transmitter, the mechanism of the failure, and puts forward anti ignition protection measures is analyzed, which significantly reduces the failure rate of the transmitter.