Giving advice by minister and adopted by the emperor was an important political regulation in Xizhou Dynasty,in which poems played an important role,such as:presenting poetry and collecting them in order to put forward advice for an emperor to run the country.

Lastly,Xu Jie Case was commonly believed that result from the“Tou-xian”(the attachment of one\'s land to other powerful,mainly imperial,etates,which benefit de facto from many kinds of exemptions);in fact the deeper reason was due to the unequal profits distribution in the process of Yangtze Delta\'s land development.

The sorting works of Tang portry doucuments of North-Song Dynasty mainly expressed in following three aspects: the compiling and collating to the poet s volumes of Tang Dynasty;the compling to the large-scale poetry and prose volumes and the relevant literary historic materials;the mixed history,unofficial history and the notes novels conserved the materials of the Tang portry.