When Xia Zhihong was in college, he became interested in the N-body problem. After graduating from college, he came to Northwest University to study the N-body problem with Sally. 1988 when he received his doctorate, he claimed in his doctoral thesis that he had found a solution to the five-body problem, which would produce a non-collision singularity in a limited time. Such amazing results were obtained by a student in his twenties, and almost everyone's first reaction was not surprise but doubt. In fact, there are some defects in the first draft of Xia Zhihong's proof, and some key proofs are worthy of scrutiny. Two years after this article, which is nearly 100 page, was submitted to Mathematical Yearbook, the most famous mathematical magazine, Xia Zhihong got an ambiguous answer. Critics can't judge whether his proof is correct, but they do point out some problems. Xia Zhihong was not discouraged. He continued to improve and supplement his proof, and then submitted the revised draft. At this time, the manuscript of Mathematical Yearbook was written by Marcel, a professor at Princeton University. In the fall semester of 199 1, Marcel organized a seminar in Princeton to discuss Xia Zhihong's paper. At the end of the semester, Marcel came to the conclusion, which proved to be correct. The paper was published in the Annual Journal of Mathematics 1992. Pang Levi's conjecture has finally been completely solved. After graduation, Xia Zhihong taught at Harvard University and Georgia Institute of Technology. From 1994, he returned to his alma mater, Northwest University, as a full professor of mathematics, and from 200 1 as a professor of mathematics for Arthur and Grady Pankou. After solving the Ponlevi conjecture, Xia Zhihong made many other important contributions in the field of power system. Although he is not yet forty years old, he has become one of the leading figures in the field of international dynamic system and celestial mechanics. 1999 Xia Zhihong was hired by Peking University Institute of Mathematics as the first batch of distinguished professor for the Yangtze River Project.