中文摘要：

胡乾善，著名振动专家和工程力学教育家．1933年毕业于清华大学物理系，1934年留学英国伦敦大学，从事宇宙射线研究工作，1937年获得博士学位后归国,1944年改行从事机械工程研究及工程力学教育工作，为东南大学力学学科的发展做出了巨大贡献．本文着重分析胡乾善对宇宙射线研究、力学研究、教学方面的贡献，深人分析了胡乾善的学术成就及教育特色．通过对胡乾善的学术与人生经历的挖掘，为近代物理学史提供史料，并学习胡乾善的高尚品质，缅怀胡乾善先生．

英文摘要：

Hu Chien-shan is a famous expert on vibration and educator on engineering mechanics. He graduat-ed from physics department of Tsinghua University in 1933, and he went to University of London to make cosmic rays research in 1934. After he received a doctor＇s degree in 1937, he retuned back. He engaged in mechanical engineering research and education of engineering mechanics since 1944, and he made great contribution to the de- velopment of mechanics of Southeast Uniersity. This paper analyzes Hu＇s research on cosmic rays, mechanics, and his education contribution, also analyzes in-depth Hu＇s academic achievements and characteristics in education. This work provieds historical materials for modern physics history through digging Hu＇s life experience and academic work so that learn noble qualites from Hu Chien-shan and memory of him.