Professor Xu has made many substantial progress in immunology research in recent years. These achievements have been published in international authoritative medical academic journals such as Journal of Experimental Medicine (impact factor 15), Proceedings of the National Academy of Sciences (impact factor 1 1), Journal of Immunology (impact factor 7) and Rheumatism of the Year (impact factor 5). After 2000 alone, the cumulative impact factor of the papers and periodicals published by the applicant was as high as 144. Because of these works, in 2005, Professor Xu was invited as a co-author to give a summary report on immunology research in the top international medical journal Annals of Immunology (with an impact factor of 52 points).