Thermal analysis of energy storage in layers of various materials used as a packed bed storage system is presented. It is more economical to minimize insulation costs, to store more energy from the same input conditions, to lengthen the time of charging that the energy could be kept stored with acceptable losses, and to obtain higher storage capacity. These are the focus of this work. A cylindrical bed is formed from three layers of different materials, equal in length, as heat-absorbing media. The bed is charged with flowing hot air in, the axial direction, the hot air representing the heat source. A transient one-dimensional model is used to describe the thermal behavior of the system. The partial differential equations that govern the flow and heat transfer for both the air and the solid, constituting the bed and their boundary conditions, are driven. The numerical solution of two partial differential equations is obtained using the finite difference method through a computer program especially constructed for this purpose. The temperature field for the air and the solid are obtained, and the energy stored inside the bed is computed. A wide range of layers of storage media of different material with different thermal properties is selected. Comparison is made between the present system and packed bed systems using one storing medium. The results show that the bed packed with different layers has higher storage capacity and there is step stratification of the temperature between the material layers. Also, the bed that includes metal material (such as steel) has a maximum storage capacity, and less considerable temperature than other beds, so such a bed can realize the claimed function.