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The methyl acryloyloxy propyl silsesquioxane(MAP-POSS) was prepared by hydrolysis condensation of KH-570, and composing free radical-cationic hybrid UV curing system with the unsaturated epoxy resin. The changes of characteristic absorption peak in the curing process was characterized by using infrared spectroscopy (FT-IR), and the influence of MAP-POSS content on the surface water contact angle, silicon elements distribution, mechanical properties and thermal performance of UV-cured film was investigated. The results show that with the addition of MAP-POSS the crosslinking degree, hydrophobicity, thermal stability and glass transition temperature(<i>T</i>_g) of the film are improved. When the content of MAP-POSS is 12% (mass fraction, the same below), <i>T</i>_g is increased by 16.9℃. When the MAP-POSS content is 15%, the water contact angle of film is increased from 58.0&#176; to 94.2&#176;. The impact strength is improved firstly and then decreased with the addition of MAP-POSS.