Mr. Yang Zhenning, a world-renowned physicist and Nobel Prize winner in physics, an academician of the CAS Member, a professor of Tsinghua University and honorary president of the Institute of Advanced Research of Tsinghua University, died of illness in Beijing on October 18, 2025 at the age of 103. On October 18th, Tsinghua University issued a document expressing deep condolences and remembrance for Mr. Yang Zhenning. According to public information, Yang Zhenning was born into an intellectual family in Anhui in 1922. He was hired as a professor in the Mathematics Department of Tsinghua University by his father Yang Wuzhi. In 1929, Yang Zhenning moved north with his parents and moved into Tsinghua Garden. After the outbreak of the War of Resistance Against Japan, Yang Zhenning, who was studying at Chongde Middle School in Beiping, was forced to interrupt his studies and move south with his family. In April 1938, National Southwest Associated University was established, and 16-year-old Yang Zhenning was admitted to study at Southwest Associated University. In 1945, Yang Zhenning was admitted by Tsinghua University as the sixth batch of scholarship students to study in the United States. According to the official website of the Institute for Advanced Study at Tsinghua University, Yang Zhenning served as a researcher at the Princeton Institute for Advanced Study from 1949 to 1955, a professor at the Princeton Institute for Advanced Study from 1955 to 1966, an Einstein Professor at the State University of New York at Stony Brook from 1966 to 1999, and a professor at Tsinghua University since 1999. In an article commemorating Mr. Yang Zhenning, Tsinghua University wrote that he was one of the greatest physicists of the 20th century and made outstanding contributions to the development of modern physics. The "Yang Mills gauge field theory" proposed by him and Mills laid the foundation for the later particle physics standard model and is considered one of the cornerstones of modern physics. It is one of the most important fundamental physics theories comparable to Maxwell's equations and Einstein's general theory of relativity. He collaborated with Li Zhengdao to propose the revolutionary idea of parity non conservation in weak interactions, and won the Nobel Prize in Physics in 1957, becoming the earliest Chinese to receive the Nobel Prize. Yang Zhenning discovered the key equation for one-dimensional quantum many body problems, the Yang Baxter equation, which opened up new directions for physical and mathematical research in statistical physics and quantum groups. His many achievements in various fields of physics such as particle physics, field theory, statistical physics, and condensed matter physics have had a profound impact on the development of these fields. He is a foreign academician of more than ten national and regional academies of science, and has been awarded honorary doctoral degrees from over twenty renowned universities both domestically and internationally. He has also received numerous honors such as the National Medal of Science, Franklin Medal, Ansar Prize, King Faisal International Science Award, China International Science and Technology Cooperation Award, and Lifetime Achievement Award. Yang Zhenning has also made outstanding contributions to the cause of science and education in our country. In 1971, he made his first visit to New China, sparking a wave of Chinese scholars visiting China. He was hailed as the first person to build a bridge for academic exchanges between China and the United States, and later proposed to the central leadership to restore and strengthen basic scientific research. He personally raised funds to establish the "China Education Exchange Committee" and continuously supported nearly a hundred Chinese scholars to study in the United States. These scholars became the backbone of China's scientific and technological development in the future. He has done a lot of work to promote domestic scientific and technological exchanges and progress, and has provided suggestions and played an important role in the formulation of major scientific projects and science and education policies in China. After returning to Tsinghua University, he regarded the development of the Institute of Advanced Study as his new career, and devoted a lot of effort and made great contributions to the development of basic disciplines such as physics and talent cultivation at Tsinghua University, which had an important impact on the reform and development of higher education in China. In 1997, 75 year old Yang Zhenning returned to Tsinghua Garden as the honorary director of the Center for Advanced Research at Tsinghua University, where he began "the last thing worth doing in his life". Since 2003, Yang Zhenning returned to China to settle down and teach at Tsinghua University, dedicating his later years to China's education and scientific research. The new sky in China is changing, and the mission of our hometown is heavy. As a student soaring through the clouds, I will be the guiding pine. "This is a poem written by Yang Zhenning under the title" Returning to the Roots "when he returned to Tsinghua Garden. In November 2023, the Tsinghua University Physics Talent Training "Climbing Plan" was officially launched, with the aim of discovering students with outstanding physics talents in advance and cultivating more outstanding innovative talents in the field of physics. The proposer of the 'climbing plan' is none other than Yang Zhenning. At that time, he pointed out in his video speech that there are many cutting-edge development directions in physics, divided into principle based and applied based, both of which will make great contributions to the development of physics in the next 20-30 years. He has high hopes for the students participating in the 'Climbing Program' and hopes that everyone will achieve success in their studies. Mr. Yang Zhenning's life is an immortal legend of exploring the unknown, and an eternal echo of cherishing his family and country. 'Better simplicity than cleverness, better simplicity than elegance' is his attitude towards scholarship and also his attitude towards life. ”In a tribute article, Tsinghua University wrote, "Just as his beloved poem goes, 'The story of Yang Zhenning's century long life is a timeless chapter that shines among the stars of humanity.'" (Xinhua News Agency)