Abstract: Effects of Cr and Mo on machanical properties and micro-structure of Fe₃Al based alloys were investigated from the point of the strain-induced microstructural changes in Fe₃Al-based alloys during room temperature deformation and high temperature creep. It is found that both Cr and Mo soluted into the matrix of Fe₃Al-based alloys. TheAddition of Cr can accelerate strain-induced disordering resulting in an effect of solution softening. The addition of Mo is beneficial to creep-induced rreordering and to increase the recrys tallization temperature, resulting in solution sirengthening.