Abstract: WANG Gen, founder of Taizhou School and civilian philosopher of Ming Dynasty, proposed the enlightening frankness thought with nature as principal aim and human as orientation. He thought that frankness required us to be obedient to nature and people’s wills. Frankness stressed subjectivity and a frank man must know to stop at a proper time and place, and must know his orientation and know to stop at perfection. Such frankness should keep mean in order to reach harmony. His frankness thought highlighted the human subjective status of the world, and showed extremely the autonomous and surpassing spirit, which is the innovative theories of his thought system.