In recent years, scholars examining the history of Republican China have begun to pay attention to the Aides’s Office of the National Military Council, an important staff agency during the Anti-Japanese War. Nevertheless, these scholars have so far mainly focused on the role the Office played in the processes of making military and political decisions, and have neglected an important task of the Aides’ Office, that is, the establishment of the Kuomintang’s Documentation of Personnel, which was initiated by Third Department of the Aides’ Office. The Office was set up on July 8, 1939. The director, Chen Guofu, was regarded as the leader of CC Clique, an important faction within the Kuomintang. The Office was divided into four groups, namely group 7, group 8, group 9, and group 10, in charge of personnel “investigation,” “registration,” “examination,” and “allocation” respectively--which included almost all the personnel matters of the various organs of the government. Moreover, the Third Department also assisted Kuomintang in building dossiers that included as many as one hundred thousand personnel files. This article explores this, the so-called highest personnel staff organization during the war, in terms of its organization, the backgrounds of its members, and its actual operations, as well as offering a discussion of its subsequent effects and results