Abstract: The compilation of the unpublished books is document collation activity and method taking the collection,compilation and collation of lost books as the core.Qing Dynasty is a flourish period of lost book compilation.The compilation of Si Ku Quan Shu,the composing of catalogue books,and the ancient Confucian classics interpretation assembling are all closely related to lost book compilation.

Key words: the compilation of the unpublished books; Si Ku Quan Shu; catalogue; the Confucian classics interpretation assembly; Qing dgnasty