In this work, the composites were fabricated by in-situ synthesis reaction and hot-pressing using Ti, Al, TiO2 and Eu2O3 as starting materials. Effects of the sintering temperature on the microstructures and properties of the Al2O3/TiAl composites were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and universal properties tests. The result shows that the sintering temperature had effect on improving the mechanical properties of TiAl composites. The phase of the composites composed of γ-TiAl/α2-Ti3Al matrix and reinforcing phases of Al2O3 and EuAlO3. The grain size of composite was smaller than 0.5 µm at 1200 °C. And the mechanical properties reached to the maximum value (477.96 MPa and 9.73 MPa•m1/2). The properties decreased with grain growth at 1300 °C.