《胡适留学日记》和《吴宓日记》(1917-1924)是20世纪早期旅美留学生日记的两类典型代表。前者建构了一个“进步”的文明国形象,后者则构造了一个“堕落”的种族主义美国形象。胡适和吴宓日记中大相径庭的美国形象与他们的文化心态紧密相关。两者分别体现了20世纪早期旅美留学生“异”痴迷或“异”排斥的典型心态。 The Journal of Hu Shi Studying in Japan and the Diary of Wu Mi (1917-1924) are two typical representatives of the diary of overseas students studying in the United States in the early 20th century. The former constructed a “progressive” civilized nation image, while the latter constructed a “fallen” racist United States image. The widely differing American images of Hu Shi and Wu Mi are closely related to their cultural mentality. Both of them reflect the typical mentality of the students of the United States in the early 20th century who were obsessed by “different ” or “different ”.