Abstract: The mechanical properties of the high temperature resistant TC11 alloys prepared by spark plasma sintering (SPS) used for engine were improved by adding grapheme, the density of TC11 alloy under the different sintering parameters was studied, the microstructure was observed, and the influencing factors of mechanical properties were analyzed. The results show that, with the increase of sintering temperature, the density of the sample increases first and then becomes stable. With the increase of the sintering pressure, the density of the sample increases slightly. With the increase of sintering temperature, more α phase is transformed into the high temperature β phase, forming a relatively stable ratio of β phase. With the increase of sintering time, the compressive strength at room temperature shows an upward trend. With the increase of sintering pressure, the TC11 alloys show the higher mechanical strength at room and high temperature. The sintering parameters for the TC11 alloys with the optimal mechanical properties are finally determined as the sintering time of 5 min, the sintering temperature of 900 ℃, and the sintering pressure of 50 MPa.