A coil coatings meeting the VOC limit of environmental regulation was prepared with a high solid polyester resin that was synthesized by step polymerization process with glycidyl versatate as a monomer. The influence of diacid，the dosage of glycidyl versatate， molecular weight and synthetic process on the properties of polyester resin was studied. The experimental results showed that in the step polymerization，firstly，methyl propylene glycol，adipic acid，hexahydrophthalic anhydride and phthalic anhydride were used to synthesize carboxyl-terminated polyester resin with 40% acid excess，then in the second step，the high solid polyester resin was synthesized by introducing glycidyl versatate，trimethylolpropane and methyl propylene glycol，with 50% alcohol excess. The high-solid polyester resin obtained showed the following characteristics：the molecular weight Mn was 1 862，solid content was 81%，viscosity at 23 ℃ was 1860mPa·s. A white coil topcoat prepared from this polyester resin provided good performance. The VOC content of the white coil topcoat during application was 305 g/L，which was in line with the limit of lower than 420 g/L.