Abstract: Silicon-containing polyurethane was prepared by using 3-aminopropyltriethoxysilane(KH550), hydroxyethyl acrylate(HEA), 2,4-toluene diisocyanate, and p-cresol as raw materials. The reaction synthesis process was tracked by infrared spectroscopy. It was found that the end-reaction of NCO-terminated polyurethane prepolymer and p-methylphenol reacted as a secondary reaction without catalyst. When the catalyst triethylamine was added, the reaction was first-order reaction at the initial stage of the reaction. In the absence of a catalyst, the activation energy of the reaction was 46.96 kJ/mol, the activation energy of the reaction was 30.28 kJ/mol when the catalyst addition was 0.1%, and the activation energy of the reaction was 18.16 kJ/mol when the catalyst addition was 0.3%. The reaction activation energy decreased with the increasing of the amount of catalyst.