The effect of system composition of the water-soluble hyperbranched photosensitive polysiloxane urethane acrylate (WHBPSUA) with three degrees of branching on physical and mechanical properties of WHBPSUA curable films including water resistance, volume shrinkage, hardness, adhesion, tensile strength, elongation and heat resistance, was investigated in this paper. The results showed that the water absorption of the WHBPSUA decreased with increasing the degree of branching of the oligomer, the content of monomer and crosslinking yield. The volume shrinkage of the WHBPSUA systems increased with increment of WHBPSUA concentration and monomer function-ality, while the volume shrinkage of investigated WHBPSUA was lower than 7%. The oligomer with a high degree of branching and multi-functional monomer could improve hardness and tensile strength of the WHBPSUA. When func-tionality of reactive monomer increased, the heat resistance of the WHBPSUA could be enhanced. The WHBPSUA possesses excellent adhesion on the inorganic glass.Cited