Therefore, NCO-terminated two-component microporous polyurethane elastomers with low viscosity (LVMPU) prepolymer was synthesized by prepolymer method using isophorone diisocyanate (IPDI) and polytetramethylene ether glycol (PTMEG) as raw materials. Secondly, 1,4-butanediol (BDO) and trimethylolpropane (TMP) were used as chain extenders, and a small amount of water in the air was used as foaming agent, two-component LVMPU has excellent mechanical properties, yellowing resistance, and light resistance was obtained by reaction curing at high temperature(130℃) after static defoaming at room temperature in the mold. The effects of different mass ratio of IPDI and PTMEG, TMP and BDO and residual NCO content on the properties of two-component LVMPU was investigated. The results show that when the mass ratio of IPDI and PTMEG is less than 250:300 and the residual NCO content is less than 2.4%, two-component LVMPU elastomer without NCO groups can be obtained; When the mass ratio of IPDI and PTMEG is 200:300, the mass ratio of TMP and BDO is 0:1, and the residual NCO content is 1.4%, the mechanical properties of the two-component LVMPU elastomer are the best; With the increase of the residual NCO content, the surface of the two-component LVMPU has no cell structure, and the cross-sectional cells increase gradually, and most of them are circular closed-cell structures with large pore sizes; When the mass ratio of TMP and BDO increases gradually, most of open-cell structures appear on the surface of the two-component LVMPU, the circular open-cell structures of the section increase gradually, the pore size distribution is relatively uniform, and the average pore size decreases.