The crevice corrosion of the benzotriazole(BTA) passive specimens of the shape memory alloy Cu Zn Al in Hank's artificial body fluid has been studied using electrochemical tests. The results show that the shape memory alloy Cu Zn Al exhibits better property than the annealed alloy Cu Zn Al. The reason is that the martensite single phase in the alloy Cu Zn Al improves electrochemical property and inhibits active solution. The occurring of crevice corrosion is attributed to the metal ions concentration cell. BTA passivation improves the crevice corrosion resistance of the alloy.