The formula of unsaturated polyester white primer prepared with unsaturated polyester resin as the main film-forming material was introduced.In view of the defects of poor paint film adhesion and easy peeling after construction,the selection and base of unsaturated polyester resin were discussed one by one.The influence of factors such as surface roughness,construction viscosity,thickness and ambient temperature on the adhesion of paint film were discussed.The results show that through the reasonable selection of suitable resin film-forming materials,strengthening of the substrate polishing process,and reducing the viscosity and thickness of the coating,the adhesion of the sprayed paint film reaches level one,which solves the problem of poor adhesion.