The TiAl based alloys with various compositions were prepared by powder metallurgy(P/M), and their microstructures and mechanical properties studied. It was shown that homogeneous Ti Al Cr Nb alloys with fine microstructures can be obtained by means of powder metallurgy. The addition of alloying elements has a significant effect on the microstructure; for example additions of Cr and B will refine the grain size. The mechanical properties of the P/M Ti Al based alloys are related to their microstructures. The finer the microstructure, the higher the room temperature strength and ductility. At high temperatures the strength increases with increasing grain size. P/M processed Ti 47Al 3Cr was found to have good room temperature properties : an ultimate strength of 526 MPa and an elongation of 1 5%.