Cesare Brandi from ltaly is one of the greatest modern theorists on conservation and restoration.In 1939,he was in charge of the construction of Central Restoration Research Centre,ltaly,and he was also the first director of the centre.“The Theory of Restoration for Cultural Relics,”which he wrote in 1969 is still the classic and academic foundation worldwide for the conservation of cultural relics'.The core of his theory is:restoration is a methodology applied for the understanding and restoration of artworks,and is based on history,natural science,aesthetics and material science.