The hydroxyl-terminated polybutadiene(HTPB) polyurethane damping material is modified by the method of adding organic small molecule N,N-Dicyclohexyl-2-benxothiaxole-sulphenamide(DZ). The results indicate that the damping performance is considerably modified when the molten DZ is added into the polyurethane complex material reaction system. Within the range of the test temperature,the loss tangent(tgδ) is greatly improved,and the the maximum value is 0.56,while unmodified one is 0.3.