Oil and gas pipeline accidents have uncontrollability.There are several serious damages after a leakage: fire and explosion,gas poisoning and environmental pollution.As much as possible to reduce the hazardous of leakage,this study describes technology of holing and plugging on non-stop pipeline with pressure,focuses on the welding tee,opening,plugging,under plugs,corrosion and other key aspects.It is found that opening rigs,plugging rig and under blocking device are developing toward large-caliber and automation.This paper also reviews the progress and benefits of inner tube intelligent repair technology.Discuss the development direction of repair technology and equipment in the future.