To address the issues of low-temperature curing powder coatings，such as low curing temperature，poor resin fluidity and incomplete curing reaction resulting in weak levelingand mechanical properties of the coating，this paper proposed the use of hyperbranched resinto modify the polyester resin structure for enhanced overall performance. The synthesis of ahyperbranched resin with appropriate reactivity was achieved by partially blocking the hyperbranched resin using stearic acid（SA）and benzoic acid（BA）. The impact of differentsynthesis processes on the properties of modified polyester resin with hyperbranched structureand its powder coatings was investigated，while further enhancement of the comprehensivecoatings properties was achieved through adjustment of the curing promoter. The results showed that the addition of 5% hyperbranching resin during the esterification stage resulted ina curing promoter a to curing agent promoter b ratio of 5∶2，with a total dosage of 0. 14%. Theoblique flow energy of the powder coating reached 91 mm，and all of them could pass the impact test at 50 cm height，which showed excellent leveling and impact resistance.