The poetry written by ambassador to North of the two Songs,is a new poetry theme which produced under a particular history background in poetry history of ancient China.

In his Record of the Ambassador Mission,the ideas of suzerain-vassal relations between China and Korea as well as Korea\'s submission when emergencies occurred were obvious.

Rejection and Recognition: Evaluating Going Northward by YUAN You of Annam;

An Analytical Study of Shen Qing s Bei Shan Lu;