In this paper, in order to build T shaped tube by hydroforming method, the drop hammer system is used which leads to the hydrodynamic load. To form the first piece as the die configuration, the hydraulic internal pressure and axial feeding is required, and in the study of this process a source of energy should be used in two ways. According to mentioned load path, the die designed to get the impact of free fall weight by pistons on the die, and it makes the hydraulic pressure. by putting the punches on both sides of the tube, axial feeding takes place with receiving the hydraulic pressure of Intermediate fluid, and the internal pressure provides with transmission the fluid from the middle hole of the punches. It is worth noting that copper and aluminum tubes have been analyzed in experimental tests. To check the numerical analysis of final pieces and improve the quality of shaping, the finite element software ABAQUS is used. The simulation model of forming T shaped tube has been evaluated dynamically by considering the effect of strain rate and mechanical properties of tube material. The results of tests show that to have favorable deformation, all the input parameters such as the kinetic energy, fluid column, sealing, Lubrication, gender and the thickness of tube should be proportional together. Also in this study, the height of the bulge has been analyzed due to the thickness distribution, axial displacement and surface embrace.