Abstract: Influence of curing parameter on mechanical property, acoustic property and thermal stability of underwater acoustic materials of HTPB polyurethane was analyzed.It was manifested that with the parameter increased, the rigidity, tensile strength and acoustical absorption property of the materials increased, and the elongation decreased.Acoustical transmission property of the material cured at parameter＜1 was better than that of others.The thermal stability of the materials cured at parametr=1 was best and the effects of curing oparameter on the density of the materials was negligible.