Plugging agent could be used to effectively reduce the incidence of lost circulation and decrease economic loss. This paper mainly introduced the research progress of new plugging agent at domestic and foreign，including bridging plugging agent，high dehydration plugging agent，temporary plugging agent，expansion plugging agent，cement quick setting plugging agent，curing plugging agent and composite plugging agent. Various plugging agents were compared and evaluated. And some suggestions were provided for the relevant researches and developments which were expected in the future.