This article reported the method about the synthesis of a foursubstituted diphenyl phosphine oxide type allene compounds. In the solvent system of anhydrous triethylamine, 1,1-diphenylhept-2-yn-1-ol reacted with chlorodiphenylphosphine in anhydrous tetrahydrofuran, it got the desired product (1,1-diphenylhepta-1,2-dien-3-yl diphenyl phosphine oxide compound) in good yield. The structure was analyzed by NMR, IR, HRMS to confirme the structures of the desired product.