In recent years, organizational trust has been considered as the key factor that enterprises acquire competitive advantage. Many scholars believe that knowledge sharing has intermediary role between organizational trust and organizational performance, but only few of empirical results were given. An empirical study on interaction among organizational trust, knowledge sharing, and organizational performance is conducted. The sample includes 120 companies in Southern China. The validity of organizational trust, knowledge sharing, and organizational performance is tested separately based on the preliminary study. The study proves that organizational trust has a significant positive impact on the knowledge sharing and it has a significant positive impact on the organizational performance by knowledge sharing , that is, knowledge sharing among employees has an intermediary role between organizational trust and organizational performance.