Abstarct: Shells are suitable structures in absorption mechanical energy of accidents and impacts. By plastic deformation, they can damped impacts that are loaded to structures and persons who placed in car. The amount of energy absorbed in the shell in during crash accidents is high. This research is tried to present suitable change in geometry of conical shell that increases the absorption energy in accidents. On the basis, experimental test are done by Hydraulic Servo 8802 and numerical analysis are done by Abaquse software, on truncated conical stainless steel shell. For study the possibility and performance possibility of increasing of efficiency in damping of energy, some changes are made in geometry of conical shells likes create holes and seams, change in location of holes, change in diameters of holes and etc. This research can help to use thin conical shell to absorb much energy. After change in geometry experimental tests are done. Results show that the conical shells with starters, decrease the maximum primary force and increase the value of absorbed energy.