Abstract: It is found that some emergency gate slots of deep-outlet of hydropower stations which have operated many years have been damaged during the second round periodic and routine inspection. The first reason is due to the erosion of carried-sand and high-speed flow. Moreover, design error and poor construction quality have an effect on it. Finally, material is another factor. Safety operation of dams will be badly threatened if it is not repaired in time. But there have some difficulties to repair even can not be finished by normal methods or spend much time and money on it. This paper introduces a new method that has been used by the two hydropower stations of Zhelin and Liujiaxia to repair the destructive section at emergency gate slots. Those two projects both have emergency gate repaired in dry and finished quite well.It can be adopted by the other projects with similar problem.?