The greatest mathematician in the world is Chen Shengshen. Chen Shengshen (Shiing, ShenChern,191year,1year1October 28th to1February 3rd), whose ancestral home is in Jiaxing, Zhejiang, is the greatest geometry in the 20th century. 1934 received a master's degree in science from Tsinghua University, 1936 received a doctor's degree in science from the University of Hamburg, 1938 was Professor The National SouthWest Associated University, 1943 was a researcher at the Institute of Advanced Studies in Princeton, USA, 1946 was the acting director of the Institute of Mathematics of Nanjing Academia Sinica,1946. 1960- 1979, professor at the university of California, Berkeley, 196 1 became an American citizen, 198 1- 1984 served as the National Institute of Mathematical Sciences (MSRI). Honorary director since 1992. On February 3, 2004, Chen Shengshen died at the General Hospital of Tianjin Medical University at the age of 93. According to this person's evaluation, Mr. Chen Shengshen is an internationally renowned master of mathematics. Mr. Chen initiated and led the research in the fields of global differential geometry, fiber bundle differential geometry and indicator class. His outstanding contribution to integro-differential geometry influenced the development of the whole mathematics. The death of Mr. Chen Shengshen is a great loss to the international and China scientific and technological circles, and also makes him lose a respected teacher. Mr. Chen Shengshen's dedication to science, his pursuit of truth and his achievements in science will go down in history forever.