Abstract: In western Sichuan deep zone,fractures are well developed, drilling leakage,even maintain or spray with the spray -drain leakage on the same floor of complex.In response to the complexity,in- depth exploration has been carried out in recent years,the plugging the bridge slurry technology,non -invasive drilling fluid plugging technology,high- acid-soluble leak plugging technology,gas drilling techniques and technology governance leak have been applied.By deepening awareness,through the leak plugging techniques and deep well plugging,the success rate increased 15.6～33.2%, and achieved good economic results.