The effect of the structure of the board of directors and the corporate governance on the performance and unconditional standards of performance of Iranian companies

since corporate governance involves a set of rules, policies and relations between stakeholders, managers and other stakeholders that ensure the establishment of control system to provide beneficiaries and prevent possible abuse, thus conflict of the interests of shareholders and managers is the main subject in corporate governance literature. Investors have sufficient impetus and power to control managers and often learn from the board as executive leverage of corporate governance. corporate governance is also believed to facilitate effective corporate governance, effective management and control of business units and is able to provide optimal efficiency for all stakeholders. on this basis, the aim of this study is to investigate and analyze the effect of the board structure (including ceo duality, institutional ownership, administrative ownership and independent auditor quality)on financial performance metrics (including the dividends of each share, stock return rate, stock return rate, ratio ratio and stock return the data of 136 companies listed in tehran stock exchange during the period from 1395 to 1398 are used and the research method is empirical and correlation. the results showed that the board structure has a positive effect on Q tobin ratio and is not meaningful for other variables. corporate governance also has a positive effect on the measures of dividends, rate of return on assets, the rate of return on shareholder rights and conservatism, but it is not significant for the ratio of stock returns and stock returns.