Abstract: Based on the research background of global financial marketization reform, this paper takes 175 countries(regions) from 1996 to 2017 as samples to investigate the heterogeneous impact of financial marketization on bank performance, test the transmission mechanism of bank credit, and summarizes the strategic enlightenment of China's financial reform in the future combined with the strategic background of the new pattern of dual circulation. The results show that:global financial marketization hinders the improvement of commercial banks' performance, developed economies show the characteristics of first promotion and then inhibition, while developing economies show the characteristics of continuous inhibition; bank credit is the intermediary variable of financial marketization affecting the performance of commercial banks, and financial marketization mainly affects the performance of commercial banks through private credit channels; under the background of dual cycle development, China should strengthen the financial marketization reform, and at the same time, it should be supplemented by necessary supporting regulatory measures to play a positive role in financial marketization.

Key words: financial marketization, bank credit, bank performance, dual circulation development