Northern Wei and Gaoli after the War between Wei and Yan;

Allying Gaoli was a basic military strategy in Northen Song Dynasty, its real purpose was to safeguard the border by allying Gaoli which was positioned to the north of Liao, the major enemy of Song.

Consciousness of Strategic Safety in Song Dynasty ′s Views on Korea;

The huis of Yuan Dynasty in the historical documents of Korean;

Second Study On Why Wang Zhang,Abdicant King Of Korea Was Exiled Westward To Tibet;

The Material and Cultural Exchanges in the Relations to "The Uncle-Nephew Rapport" between Yuan Dynasty and Koryo;

Cultural Outlook on the Relations between the North Sung Dynasty and Koryo:Compared to Those between the Liao Dynasty and Koryo;