To study the mechanical property of galvanized steel wire under service environment, 16group of specimens were subjected to the load and environment coupling effect experiment, with the parameters of corrosion time and loading method. The results show that with the increase of corrosion time, the increase trend of mass loss ratio accords with the Boxlucass function, and the yield strength and elongation of specimens after fracture present a gradually decrease trend. When at the same corrosion time, the mass loss ratio and the yield strength decrease amplitude are alternative stress＞static stress＞unstressed. Loading methods and corrosion time have little effect on specimen bearing strength. The elastic modulus of specimen decreases obviously after 1200h coupling effects of alternate stress and corrosive environment. Based on the 5 level corrosion standard, the more detailed qualitative description and relative analysis were given. At the same time, based on the Boxlucass model, the calculated formula of mass loss ratio was fitted out.