CAO Jiaqi is a professor of Department of History at Sun Yat-sen University. His research interests include the study of Song, Liao and Jin history and literature, the history of ancient Chinese transportation, and the history of ancient Chinese music. His publications include the Transportation and Politics in Song Dynasty, the Study of Transportation Regulation in Song Dynasty, and YU Jing, The Famous Official of Northern Song Dynasty. He has published over 100 articles on various academic journals.