Qingyang Collected Works was written by the loyal officer ,Yu Que ,in the Yuan Dynasty ,w hich recorded army stationing in Hefei ,the local customs ,the local social lives ,the Hefei city wall building ,the wealthy and educated families ,the Western Xia race migrating in Hefei , peasant rebellions , the important officials , the trapping of the Hefei city and agricultural development in Hefei six hundred years ago .It helps to reveal the social and local real life in Song and Yuan Dynasties ,w hich is a significant historical document and valuable treasure contributed by Yu Que to Hefei .