The choice of a suitable structural system in high-rise structures is very important from point of economy and the performance of the building against loads on it. Central core is usually used to withstand loads in high structures. The cores are usually formed from a number of orthogonal walls connected together and they form a section like a can. Providing stiffness and ductility of these types of sections is one of the main issues for structural designers. For this reason, in this study, to investigate the performance of a central core of reinforced concrete and steel shear walls, a 45-story high-strength structure with asteel felxible frame system with a centeral steel core and reinforced concrete with equal strength in SAP software in Tehran was analyzed. The design of these structures is based on static and dynamic spectral analysis, and these structures are evaluated under three different records by dynamic analysis of linear time histories. In the study of two 45-story structures with steel core and reinforced concrete with SAP software, the results showed that in this structure with reinforced concrete core, drift, displacement and base shear were 44.9, 53.1 and 44.3% higher than steel core structure, respectively. The cutting base of the reinforced concrete core is 68.5% higher than the steel core.