Abstract: Poly(butyl acrylate)/TiO2 (PBA/TiO2) grafting composite latex with grafting percentage of 13.5% was prepared by in-situ emulsion polymerization, and the ultraviolet resistant finishing of cotton fabric was performed with this grafting composite latex via dip padding. The results showed that the treated cotton fabric has excellent ultraviolet resistant property and washing resistance. Large amount of TiO2 was successfully attached onto the surface of cotton fabric and evenly distributed, as observed by SEM. It was considered that the presence of PBA grafting composite on the surface of TiO2 nanoparticles inhibited the agglomerating tendency of TiO2 on the surface of cotton fiber so that the compability and adhesion of TiO2 with fiber were enhanced, imparting the finished cotton fabric good ultraviolet resistant property.