Abstract: A cyclic carbonate-functionalized polysiloxane (CCPS) was successfully synthesized by hydrosilylation of poly (methylhydrosiloxane)(PMHS) with allyl glycidyl carbonate (AGC) by using H2PtCl6 as catalyst.The CCPS was subsequently incorporated into gallic acid-based non-isocyanate polyurethane (GNIPU) networks to form GNIPU-CCPS composites.The chemical structure of CCPS was characterized by FT-IR,1H NMR and 13C NMR,as well as,the effects of CCPS on mechanical and thermal properties of GNIPU were investigated.The GNIPU-CCPS coatings exhibited excellent properties such as flexibility (0.5 mm),adhesion (grade 1) and impact strength (≥ 50 kg·cm).Furthermore,with the increase of CCPS content,the thermal stability,flexibility and water resistance of the coatings were increased,while the glass transition temperature and pencil hardness of the coatings were decreased.