Name:jing_hua Xu, Professional post: Professor.  I graduated from Wuhan University of Surveying and Mapping( Now It belong to Wuhan University) as a cartogragher In 1982.From Feb.1982 to Aug.1985 I Worked In Bureau of Surveying and Mapping of Sichuan Province as a assistant engneer and a manager answsering for map production.During the period  I as a member of the delegation of surveying and mapping bureau of our country  had investigated the surveying and mapping production technology of Canada for forty days. From sept .1985 to jun.1988 I studied in Wuhan University of Surveying and mapping as agraduate student and at last I had gotten the degree of maste .From jul.1988 to jul.1996 I worked in Institute of Mountain and Environment,Chnese Academy of Sciences.During that time I had served successively as assitant researcher,Vice researcher,Vice section chief of the Science Research Management Section.Since jul.1996 I work in the Department of Surveying and Mapping in the Civil Institut in South West Jiaotong University as a  professor.