After the transition of Song dynasty to the south, the national center of economics moved south. Suzhou then was just second to Ling'an and was one of the centers of politics, economics and culture. Therefore, silk weaving industry developed more quickly. In order to satisfy the cultural need of the ruling class, there appeared a kind of very thin brocade, for the purpose of mounting pictures. Suzhou was famous for such brocade. Those old and beautiful pictures are preserved together with the brocade. They are habitually called Song Brocade. Song Brocade accepts the tradition of ancient normal brocade, adopting "Fang Sheng" decorative patterns, which show their changes in strict symmetry. In the usage of colors, there doesn't exist the sharp contrast of colors, instead, several similar colors of nearly the same brightness and darkness, were used to achieve the artistic effect of prominence through contrast.. It looked just bright without seeing too strong. It was splendid and in good order.