About the AuthorShangji SiTu, professor and doctoral superviser, director of Society for Research on Pearl Liver Culture, is a specialist in the field of historical geography and cultural geography who has taken charged of several national natural scientific projects. He wrote about 35 books on the study of the above-saying subjects,such as Research on Development of land in Hainan Island, Cultural Geography of Guangdong, Cultural History of Pearl River, etc.