Wang Chi (Lung-hsi) was the most brilliant student of Wang Yang-ming. Because of his doctrine of sih-wu (四無), it was assumed that he has misinterpreted the doctrine of his master about liang-chih (良知) according to his own understanding. In this article, I disscuss some important aspects of Wang Ch's concept of liang-chih. In my opinion, Wang Chi's Interpretation of Wang Yang-ming's philosophy was convincing. I also point out that Wang Chi has clarified Wang Yang-ming's doctrine of liang-chih and promoted the development of Yang-ming school.