Liu Yun is professor and dean of the School of Electronic and Information Engineering at Beijing Jiaotong University. He is member of the academic committee and member of Teaching Steering Committee of Beijing Jiaotong University. His major specialty lies in computer network and information technology, network security, and management information systems.

He has taken the responsibility and participated in over 40 scientific research tasks, included in the National Scientific Key Projects of the 8th Five-Year Plan, tribute projects for the fiftieth anniversary of China, and key projects for the Ministry of Railways. He is the chief editor of the textbook Application of the Internet, published by Tsinghua University Press. He has been in charge of more than 30 scientific and research projects and published over thirty papers.