Abstract: Disc plugging technology has been widely used in rush repairs of pipelines, however, faults may occur in disc plugging device due to some objective or subjective factors in actual application, which will result in a poor plugging. This paper introduces the equipment composition, technical principles and plugging process. Taking the rush repair of pipeline as an example, it proposes corresponding solutions to the faults due to non-feeding when opening hole of cutter, cutter sticking, fail to reach at position for the plug and that of plug at T-joint, etc., and analyzes the shortcomings of disc plugging device, and proposes improvement methods accordingly. It is considered that increasing the applicable pressure and pipe size of disc plugging device, and enlarging the applicable range of on-line plugging to allow the technology to be applicable in renovation, update and rush repair on the pipelines with different pressure are future development trend of disc plugging technology.