Abstract: The Mg alloy matrix composite reinforced by shape memory alloy TiNi wires was fabricated by Spark Plasma Sintering (SPS) process of AZ31 Mg alloy plate with TiNi SMA wires. The microstructure of TiNi reinforced Mg alloy composites was analyzed by microscopic analysis methods, including OM, SEM and EDS. The transformation of TiNi wires was analyzed by DSC and XRD. The mechanical properties of the composite materials at room temperature and high temperature were studied by quasi-static tensile test as well. The results show that a 2 μm mutual diffusion layer of Ti, Ni and Mg forms at the interface of the TiNi/Mg composite. The tensile properties of the composite at high temperature are better than RT. The yield strength, tensile strength and elastic modulus of the composite are higher than that at room temperature (157 MPa, 292 MPa, 22 GPa, respectively), i.e. increase by 12%, 33% and 29%, respectively, at 100℃, and higher than that at room temperature(143 MPa, 251 MPa, 20 GPa, respectively), i.e. increase by 2%, 14% and 18%, respectively, at 150℃.