Based on polyester modified hydroxyacrylic resin，a primer-topcoat-in-oneformulation for roller applied wind turbine blade coatings was developed，which met the need of roller applied wind turbine blade coatings. The results showed that the combination offluoro-silicone defoamer and polyether modified silicone defoamer could eliminate the bubblesproduced by the roller application. The combination of fluoro-silicone and fluoro-polyacrylatecould achieve an excellent leveling effect. The combination of fumed silica and modified ureacould eliminate the problems of“orange peel”and sagging on the vertical surface of a windturbine blade. The type of matting agents and solvents in the formulation also contributed aneffect to the surface finish.