Water erosion damage (WED) is one of the main problems that cause damage to the last stage titanium alloy blade of steam turbine. It is extremely easy to cause the proportion of failure accidents of low?pressure rotors by WED. The preparation of water erosion resistant coating on the surface of turbine titanium alloy last stage blade is an effective measure to improve its anti?erosion ability and ensure the safe and reliable operation of the unit. In this paper, the preparation processes of the commonly used anti?erosion coatings on the surface of titanium alloy blades are introduced, which expounds the research status of the technologies such as electric spark strengthening, thermal spraying, laser cladding and laser surface alloying. The summary and prospect of these technologies are presented, so as to provide some references for the preparation of anti?erosion coatings with high hardness, good wear resistance and firm bonding on the surface of titanium alloy last?stage blades of steam turbines.