Yu Ying-shi is the famous minded historian now,Hu Shi is the central academic figure in the 20thcentury.By studying Yu Ying-shi's comment on Hu Shi,we can learn about Yu Ying-shi's academic thoughts in a different view.In Yu Ying-shi's research on Hu Shi,he not only continues his Inner Logic analysis,but also analyzes the "May Fourth Movement" through a multiple cultural view and makes a "final judgment" of the doubtful case about the Doctoral degree of Hu Shi by the manner of anti-citify.The diversity of Yu Ying-shi's research methods and the attitude of the history is expounded therefore.