Superalloy IN718 large tube is used in critical jet engine applications, while manufacturing such components, the control of temperature during tube hot extrusion is of paramount importance. To determine the relation between technological factors and the temperature rise, extrusion force during tube hot extrusion of superalloy IN718, a numerical model was developed to for the large tube hot extrusion through die and over mandrel. The constitutive behaviour of the material and friction at the extrusion temperatures are established as a thermoplastic process. In order to investigate the influence of technological parameters of extrusion process on the temperatures rise and extrusion force, then the extrusion variables such as friction factor, ram speed, tool and billet preheating temperature are taking into consideration. Besides tool preheating temperature, other parameters have a great influence on temperature rise of billet during the extrusion process. All of technological parameter of study in this paper have a significant influence on the extrusion force. Moreover, based on the simulation results, the case with tool preheating temperature of 300°C should avoid during the technology making.