Abstract: A series of stable alkoxysilane-modified acrylate latexes with various alkoxysilane fractions were synthesized by miniemulsion polymerization.A small fraction of alkoxysilane side groups were incorporated into acrylic main chains via copolymerization.The hydroxyl oligomer alkoxysilane was grafted to the main chains via the condensation reaction of the hydroxyl groups with hydrolyzed alkxoysilane groups.It was found that：(1)γ-methacryl oxypropyl trimethoxysilane (MPMS) was a better alkoxysilane comonomer than vinyltriethoxysilane (VTES)in terms of colloid stability during polymerization and the hydrophobic property of the resulted polymer coating;(2)when MPMS was used, the colloid stability was very good either during polymerization or in storage;(3)the oligomer alkoxysilane was grafting onto with a grafted degree around 50%;(4)the oligomer alkoxysilane dramatically increased the hydrophobic property of the resulted coating.The water contact angle increased from 75° to 95° with 10%(mass) oligomer alkoxysilane and further up to 105° with 20%(mass) oiligomer alkoxysilane.