Window is the most important architectural components. Bet development in window technology is very difficult because of complexity that must secure sight, natural lighting and ventilation at the same time. In recent years, as well-being and sense of environmental are heighten, we need new functional such as thermal comfort, articial intelligence and human sensibility technology in addition to existing features. This paper is concerned with development of convergence window system integrated window, insulation shutter and shading system. Convergence window system has various advantages, while vulnerable to thermal bridge because convergence window system was combined with various components For deriving development of convergence window system, first we analyze the thermal performance and thermal bridges though computer simulation program. We changed material of head and jamb component. Through analysis of Therm result we tried to find best design for decrease thermal bridge. This simulation analysis was adequately reflected convergence window system design. We are embarked on a path to build a prototype model through primary study and verified a thermal performance through KS F 2278, Test Method of Thermal Resistance for Windows and Doors. In this test, it was found that compared to a general window system, convergence window system has improved thermal performance about 30%.