Abstract: In the presence of dibutyl tin dilaurate(T12)as a catalyst, a NCOterminated and polyetherblocked polyurethane intermediate(PU) was synthesized by reaction of the 1,6hexamethylene diisocyante(HDI) and polyethylene glycol 200(PEG200), then hydroxypropyl acrylate(HPAA), dodecafluroheptyl methacrylate(RfAA) and azobisisobutyronitrile(AIBN) were added in the PU intermediate and copolymerized in methyl isobutyl ketone solution for 4-6 h. After the loading of —NCO blocking agent butanone oxime(EtAO) the low boiling solvent was stripped from the reaction mixture, a novel soil release finishing agent, polyurethane modified fluorinated polyacrylate(FPUA) with proper viscosity was obtained. The chemical structure and film morphology of FPUA were characterized and investigated by infrared spectrum(IR),1H nuclear resonance spectrum(1HNMR)， 13C nuclear resonance spectrum (13CNMR), atomic force microscope(AFM), scanning electronic microscope(SEM) and other instruments. Results indicate that FPUA can form a hydrophobic, nonhomogeneous structural film on the surface of the treated fabric or silicon wafer, which could cause the water contact angle of the treated fabrics reaches 146.5° and the salad oil contact angle reaches 132°, and the soil release performance is excellet.