Elastic polyurethane resin has excellent elastic properties and other mechanical properties,and plays a vital role in radome coatings and rubber coatings.In this paper,polycaprolactone resins PCL1000/2000 with different molecular weights are successfully synthesized to replace the Daicel products PCL-210N/220N.The chemical structures and molecular weights of the prepared resins are determined by Fourier transform infrared spectroscopy(FTIR) and proton nuclear magnetic resonance spectroscopy(~1H NMR) and gel permeation chromatography(GPC) were characterized.The effects of different diol polymer resins as linear soft segments and molar ratio of NCO/OH on the elastic properties of NCO-terminated prepolymers are studied.The effect of cross-linking and curing of different hydroxyl resins,amino resins or epoxy resins and NCO-terminated prepolymers on the elastic properties and other mechanical properties are also studied.The results show that the NCO-terminated prepolymer which the polycaprolactone resin PCL-1000/2000 is selected as the soft segment and the NCO/OH molar ratio is 1.5 is cross-linked and cured with poly aspartate.The elongation is greater than 400%,the strength is greater than 15 MPa,and other mechanical properties(adhesion,wear resistance) are excellent.