Abstract:By analyzing the framework of Leizun hall,which is a typical Square Three Bays-hall,the paper perceives it inherited the“Tingtang-type Framework formed like the Chinese character‘Jing’”and optimized further by applying huge triangle beam and reducing columns,simplifying Toukong,strengthening the Gable-on-hip roof and so on. At the same time,compares with the counterparts of Song and Yuan Dynasties,the paper discusses further the evolution characteristics of Suzhou Square Three Bays-hall during Ming and Qing Dynasties,considers that their plane scale changing periodically,main structure synthesizing with vice frame structure and Gable-on-hip roof optimizing. Finally,explain their reasons departly