some experiments were done for 20CrMnTi under the conditions of temperature range between 650 ℃ and 850 ℃. The stress strain curve of alloy for warm deforming process and the curve between mechanical properties of workpiece after low deformed heat treatment and deformation parameters have been given. An equation between the peak rheological stress of this alloy for warm deforming process and deformation temperature and an equation between mechanical properties of workpiece after low deformed heat treatment(quenching) and deformation parameters have been established. The results show that this material has excellent warm forming properties and higher mechanical properties can be gained after low deformed heat treatment.