Abstract: According to the statistics of the field survey and literature, there are 150 general archives, 2933 boxes (folders) and 1796 rolls of microfilm of China's Anti-Japanese War collected by Hoover Institution Stanford University. The files were mostly written, printed or collected by Sino-US personnel who served in various fields like politics, economy, military and foreign affairs, etc. during the Anti-Japanese War. A few governmental institutions, social organizations and individuals also contributed to these files. The Carrier forms of the files are mainly composed of diaries, letters, the electric drafts, memos, memoirs and works. The contents of the files cover the wartime China's military, politics, diplomacy, economy, and society. They are very precious for the study of China's Anti-Japanese War. According to the subjects' posts and power and the outline of the the texts, this paper classifies the files into six categories: comprehensive, political, economic, military, diplomatic, social.