This research mainly adopts gamma spectroscopy to detect the pipeline retention.The calculation of retention of uranium has been obtained based on the intensity of gamma rays of 185.715 keV emitted by ~(235)U,and the analysis method for the pipeline retention has been established. This research primarily by gamma spectroscopy to detect the pipeline retention. The calculation of retention of uranium has been based on the intensity of gamma rays of 185.715 keV emitted by ~ (235) U, and the analysis method for the pipeline retention has been established .