Abstract: Under the condition of water with high sand content in pump station of Ningxia-sea pumping Project, the pump seal ring is easily worn out. The oxy-acetylene flame spraying process is used to spray Ni-based self-fluxing alloy powder on the base of cast steel seal ring and three different pumps are employed for wear resistance experiment. The results show that new seal rings gain great advantage over the cast steel seal ring in both wear resistance and cavitation and its life is over 2. 75 times longer than that of the cast steel seal ring.