Abstract: In the development of city，it is a real challenge that how to deal with the old buildings． Too many old buildings are disappearing in the rapid development of China． Based on the analysis of the design award cases， various means in passive technologies that can be used for old building renovation were summarized． Through the simulation，it was found that for the old buildings with large length，the changing of the overall layout can improve the natural ventilation efficiently and the shading ability． Furthermore，the green technology of the exterior structure can improve the buildings shading and lower indoor temperature in summer．