: Gas turbine blade requires high geometrical precision and mechanical properties including strength, creep, low-cycle fatigue crack initiation and crack propagation characteristics due to its difficult working conditions.In addition, conventional forging process could not gain special mechanical properties for turbine blade of nickel based super alloy; some special care should be taken.Forging process of gas turbine blade requires advanced tools for design and analysis of forging process due to the sensitivity of the properties of the material to process conditions and complexity of the shape product.In recent years, finite element method has been extensively employed to research blade forging process, providing helpful information of several process parameters, as material flow, stress, strain, strain rate, temperature histories during the deformation process and forging force.For nickel-based alloy 718 until now, Park et al. (2001) presented the two-step forging process with a technique for heat treatment and lubrication and controlled microstructures.Na et al. (2003) carried out 3D simulation of microstructures for nickel-based alloy 718 blades forging using 3DFE method.In this paper, the two-step forging process with the heat treatment during process is designed to manufacture nickel-based alloy 718 turbine blades.FE analysis of this thermomechanical processing of the gas turbine blade is carried out and the thermomechanical results of the simulation is discussed by using of microstructure analysis results of nickel-based alloy 718 forging process. On the bases ofFE results, the practical forging process is recommended.It is considered that the forging process is hot, the material under the forging process follows an elasto-viscoplastic path in stress-strain plane, and its properties are isotropic.The flow rule has been followed the Prandtle-Reuss’s rule and Von-mises yield criteria has been prevailed. 8-node 3-D element for blade modeling and 4-node 2-D element for die modeling has been used. Contact condition has been defined by using of penalty formulation. For plastic deformation on billet, trivia incremental displacement method has been used.All of the deformation stages from initial cylindrical billet to the final blade has been designed and simulated. Then the thermomechanical results of the simulation such as the material flow, load, strain, temperature has been obtained and discussed.At the end, as a validation of the simulation results, the load in the preforming process by using of the analytic method has been calculated and also the flow behavior of nickel-based alloy 718 was presented elsewhere [12] has been compared to as those in the simulation. Key Words: Gas turbine blade, Forging process, Nickel-based super alloy, Elastic-viscoplastic