By means of rapid heating cyclic heat treatment, the microstructure of a TiAl-based alloy was refined.The colony size and lamellar spacing were measured to be 50 μm and 0. 12 μm, respectively. The compression mechanical properties were determined at room temperature and the best comprehensive mechanical properties can reachσ0.2 of 745.1 MPa, σp of 1 672.2 MPa and δ of 19.40%. The improvement of mechanical properties is caused by themicrostructural refinement and the phase interface nucleation contributes a lot to the refinement of microstructure.