Introduction to Wu Youxun: Wu Youxun (April 26, 1897 - November 30, 1977), courtesy name Zhengzhi, was the founder of modern physics in China, a scientist, and an educator. He made important contributions to the establishment of the Compton effect with his systematic and exquisite experiments. He has taught in many universities and trained several generations of scientific talents. He is an outstanding leader and organizer of China's scientific undertakings, and has played a positive role in promoting the establishment and development of Chinese scientific undertakings, especially new disciplines.