The main objective of the study is to address the economic effect of internal audit in improving the quality of external audit in the light of achieving the requirements of Environmental corporate governance rules, Analyzing the relationship between internal audit and Environmental corporate governance rules, analyzing the relationship between the quality of the external audit process and Environmental corporate governance rules, and testing research hypotheses on the relationship between internal audit and Environmental corporate governance rules to improve the quality of external audit in the Libyan business environment. The logistic regression model was used in this study to test its hypotheses, and the study population was represented by agriculture sector companies: Al-Haram Company, Al-Jusoor Company, Al-Tafani Company, and Al-Itqan Company. The study reached the development of Environmental corporate governance from a scientific and practical point of view, in line with technological and economic developments, with the aim of solving the problems of separating ownership from management, It also concluded that the success of Environmental corporate governance