Abstract: Majitang Hydropower Station is the first tubular hydropower station in China, there are no emergency gate set ting in 23 spillway gates, so those working radial gates can not be tested and repaired. The phenomena which dangered dam safety operation of gate body corrosion, sealing destroyed and so on occurred. Finally, plan of stoplog emergency gate has been carried out and successfully set it under the condition of keeping water-level.?