The “1·11 fire” in 2014 has devastated the core area of Dukezong ancient town in Shangri-La, and eight heritage buildings were badly destroyed, among which Xiajugangda, the traditional Tibetan buildings was devastated in the fire. After identifying its authenticity, restoration was aimed at recovering its overall layout and style in 2005 at the original site, however, the restoration failed to achieve the expected result during the gambling between the government and the owner. Through recording the process of “damage assessment— restoration design—construction process—reuse”, the paper analyses the differences between the ideal and present situation, and summarizes the key points and methods in restoration work of heritage buildings and introspects its shortages, then puts forward the ideal restoration methods for heritage buildings. We must protect its authenticity by a scientific restoration method dynamically and actively, motivate the collective sense of honor, adopt minimized intervention and proper intervention concept, and then change the dominant restoration pattern from residents to centralized professional team.