Abstract: The thermal analysis is more important for high reliability and short design cycles in electronic gun design. The high temperature, produced during electronic gun working, results to the thermal-stress of the components, and has effects to the parameters and lifetime of the gun. This paper provided the thermal and structural analysis of the electronic gun using ANSYS package. The results of thermal and structural analysis for complex and simple model were compared. The results of thermal analysis are helpful to the optimizing design of electronic gun.