The microstructure and properties of hot rolled Ti 24Al 11Nb 2Si and Ti 24Al 11Nb 5Si intermetallic alloys are studied. The results indicate that the precipitate (Ti 5Si 3) in both alloys becomes finer and tends towards a homogeneous distribution with increasing the deformation amount. The larger the deformation amount is, the higher the values of four point bending strength of the alloys at room temperature are. Because larger amout of Ti 5Si 3 exists in Ti 24Al 11Nb 5Si alloy,the bending strength of Ti24Al 11Nb 5Si is higher than that of Ti[ 24Al 11Nb 2Si with increasing the deformation amount. The bending fracture morphologies of both alloys at room temperature show the characteristics of quasicleavage mode, and the bonding strength of phase boundaries is strong. The tensile experiments at high temperature show that the tensile strength and plasticity of Ti 24Al 11Nb 2Si increase with increasing the deformation amount. Because of Ti 24Al 11Nb 5 Si alloy having larger amount of Ti 5Si 3 and larger deformation amount, its tensile strength is much higher than that of Ti 24Al 11Nb 5Si, but its plasticity becomes much lower. The strength of both alloys decreases and their plasticity increases with increasing temperature.