Abstract: We reported herein the total solution to the two common problems of the double-stage gas-cooled Roots pump,installed in 660 MW thermal power plant,one is the body temperature-rise and the other is the pressure build-up in fore-vacuum cooler and vapor condenser.The reason was that,as the water volume increased in fore-vacuum cooler,originated from condensation and accumulation of hot-team,the flow-rate at the pump's outlet significantly decreased because of water blockage along gas path,resulting in the deterioration of gas-cooling and pressure build-up in fore-vacuum cooler and steam condenser.The total solution was the self-developed water remover,which is capable of removing the condensed and accumulated water effectively,automatically and continuously.Test results show that the novel water-drainager works pretty well.We suggest that the self-designed water-drainager be of some technological interest for Roots pumps application in thermal power plant.