Many large and medium-sized converters in domestic steel plants began to adopt sliding gate slag-blocking tapping technology.The supporting tap hole bricks have become one of the factors affecting the development of the sliding gate slag-blocking technology.In this paper,the application of the sliding gate slag-blocking tap hole brick is analyszed,the damage reason is studied and the improvement measures are  put forward.The improved and developed long-life tap hole brick has a good application effects.