Abstract: As a famous scientist specialized in mechanics and applied mathematics, Professor Guo Yonghuai had made an outstanding contribution to gas dynamics and its applications in China. Before his tragic death in an air accident during a working trip in 1968, Guo had been the editor-in-chief of Acta Mechanica Sinica. Under his leadership, the Journal has established and kept up high academic standard, fairness and the truth-seeking spirit.We give here a very brief description of his illustrious life and publish so...