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In this paper, the effect of service conditions at different temperatures ( 77K ~ 77:3 K) on the mechanical properties of entropy alloy in VCoNi was studied. Grain size of VCoNi alloy was adjusted by large deforma tion rolling and short time annealing. The change rule of material mechanical properties was st udied by quasi static tensile test and the internal mechanism was explained by microscopic observation. at 77 K, a large number of twins and twisted dislocations in the material made the alloy have excellent comp rehensive properties. With the increase of experimental temperature from 29:3 K tO 57:3 K, the elongation and mechanic;d properties of the materials remained stable. When the experimental tempen1ture reached :37:3 K, the serneted flow appeared on the stress-strain curve. [ABSTRACT FROM AUTHOR]