Abstract: The creep resistance was investigated by means of study on the creep curve and deformation microstructure for new zirconium alloy. It is known that Nb has good strengthening action on zirconium alloy, and also has complex effect on creep resistance of zirconium alloy. The zirconium alloy containing 3%～5%Nb has better creep resis- tance below 400 ℃, but lest while containing 15%Nb. When Nb adds to 30%, the creep resistance of zirconium alloys begins to rise. Recently, the mechanical properties of new zirconium alloy plates containing 0.3%Nb were studied. The results show that the tensile properties of new zirconium alloy plate in industry processing does not obviously increase, compared with Zr-4 plate. But its creep resistance is much better than that of Zr-4 plate. For example, under 400 ℃ and 157 MPa stress, the creep fracture time of new zirconium alloy is 5 times more than that of Zr-4 alloy, and under 137 and 117 MPa stress, the creep ratio of new zirconium alloy is less than that of Zr-4 alloy greatly.