Abstract: The title mainly discusses how to delay the service life of X-ray detectors which are used in petroleum engineering construction. We investigated the service life of X-ray detector in construction site and carefully analyzed the causes. Three main causes that are violating process, long time working, vibrating in transportation, have been found by the methods of verification and measurement etc. Some specific measures for these causes have been made to delay the service life of X-ray detectors. They achieved good effect, all detectors’ service life exceeded rated life.