The electrochemical property of zir caloys is one of the most important fa ctors that affect the safe function o f nuclear reactor.To systematically study the influence of irradiation damage on the electro chemical property of zircaloys and g rope for the new way to improve it,the survey of effects of irradiation-in-pile on the electrochemical pro perty of zircaloys is offered,and th e mechanism of irradiation damage in piles is studied.Influence of neutr on irradiation,one main irradiatio n,on the microstructure and oxidation property of zircaloys,is empha-sized.The method of simulation of neutron irradiation in piles by ion bom bardment out of piles,is characterized by short time,low expense and no pollution.The development of this method is further described,an d the means how to choose parameters o f ion bombardment tests is more deeply analyzed.