Managers can maximize shareholders' wealth by managing variables in the financial structure (such as capital structure, dividend, and investment). Using corporate governance mechanisms, shareholders try to guide managers in this direction. The sample of this research is the statistical tests in past experimental studies that experimentally tested the research hypotheses. In this research, with the meta-analysis approach (in seven stages), the influence of the aforementioned variables on corporate governance and their effect on financial performance is tested. Due to the presence of three intermediate variables, three hypotheses about the effect of corporate governance on the mentioned variables and three hypotheses about the effect of intermediate variables on financial performance, and one hypothesis on the direct effect of corporate governance on financial performance were designed and 64 studies including a total of 260 effect size (r type) that their publication dates were between 1993 and 2019 were meta-analyzed. In the groups of the sample where the effect sizes were divergent, the random effects method, and for the convergent cases, the fixed effects method was used to calculate the cumulative effect size. Based on the results, corporate governance affects financial performance, capital structure, dividends, and investment. In addition, all three variables of capital structure, dividend, and investment have a significant influence on financial performance. For each hypothesis, after determining the size of the joint effect, a robustness test has been performed and analyzed on the results.