Abstract: The TPI-EVA triple shape memory composites were prepared by compounding trans-polyisoprene and poly(ethylene-co-vinyl acetate) (TPI-EVA), and designed cross-linking reaction of dicumyl peroxide to connect the two phases. The TPI-EVA composites were characterized by rheometer, universal testing machine, XRD, DSC and dynamic thermomechanical analyzer (DMA). The effects of the mass ratio of EVA on the mechanical properties, phase structure, crystalline properties and triple shape memory properties of TPI-EVA composites were studied. The results show that with the increase of the mass ratio of EVA, the crystallization temperature (T_c) of TPI decreases from 14.7℃ to 8.2℃, and the T_c of EVA increase slightly. SEM test showed that with the increases of EVA mass ratio, the phase interface of the composites changes from smooth to rough; DMA test shows that the increase of EVA mass ratio increases the first temporary shape memory fixation rate of the samples from 57.6% to 88.5%. Moreover, the TPI-EVA composites exhibit excellent mechanical properties, the tensile strength is as high as 30.3 MPa and the elongation at break reaches 490%.