Abstract: Signal System and Integrated Supervision and Control System were highly integrated in Traffic Integrated Automation System(TIAS) of Beijing Metro Line 6. The TIAS was established on the unified home-made software platform RT21 to implement the different service function of PSCADA, BAS, ATS, and the linkage between traffic information and electromechanical equipment information. This article introduced the structure and functions of TIAS of Beijing Metro Line 6.