ffect of Zr addition on the property stability of CuZnAl alloy was investigated. It showed. Zr- doped could reduce martensite stabilization trend and improve property stability in the mid-temperature. X-ray diffraction results showed that Zr restrained the variation of order parameter and the formation of equilibrium phase when the alloy aged in the mid-temperature.This might have relation with the change of excess vacancy concentration which resulted from grain refining.