This study examined the effect of management ability on the performance of companies in Tehran capital market with the mediating role of capital structure. We were analyzed and investigated using data collection through past information (post-event) to be included in descriptive-correlational studies. In addition, the information Rahavard Navin software and Tadbir Pardaz software and the audited financial statements and notes of the companies are used to collect the relevant data. Our statistical population in this research consists of all companies in the capital market of Tehran, some of which have been selected and analyzed in this study. In this study, data analysis was carried out for companies in the Tehran capital market from 2016 to 2022 using Eviews software and dynamic panel model (PMG). The method used in this research is descriptive-analytical; to match the economic theories with the realities of the society, the causal relationships between variables were investigated using statistics and figures, and after matching with the theories, using inferential statistics and dynamic panel econometric method and ARDL panel model were tested in Eviews software to reject or prove the presented hypotheses, which were accepted according to the results of all three research hypotheses in both models.