On this day, 31 years ago, on April 28, 1994 (March 18, 1994 in the lunar calendar), Liu Da, Honorary President of Tsinghua University, passed away. Liu Da (1911-1994) served as President and Secretary of the Party Committee of Tsinghua University from April 1977 to May 1983 (Director of the Revolutionary Committee from April 1977 to June 1978, and not Secretary of the Party Committee in July 1982). In May 1983, he was appointed Honorary President of Tsinghua University. Liu Da, male, Han nationality, famous educator. People from Zhaoyuan, Heilongjiang. He studied at Fu Jen Catholic University in Peking and participated in the "December 9th" Movement. Joined the Communist Party of China in 1936. While supporting Tsinghua University, he played a major role in setting things right and clearing away the damage caused by the Cultural Revolution to Tsinghua University. He adjusted the layout of the school and made a preliminary plan to transform from a multi-disciplinary industrial university into a comprehensive university focusing on engineering, integrating science and engineering, and combining economics and liberal arts. He restored and added the Department of Applied Mathematics of Science, the Department of Modern Applied Physics, the Department of Liberal Arts and Foreign Languages, the Department of Social Sciences, and the Department of Economic Management, etc., and put forward the goal of building Tsinghua University into a "high-level China socialist university" to gradually put the school's teaching, scientific research and various work on the right track. It laid a good foundation for the development of Tsinghua University in the new era.