日本僧人空海(774—835),随日本的第17次遣唐使入唐,归国后应“一多后生”的要求,撰成了《文镜秘府论》一书,书中保留了大量六朝至唐代的重要文献。但此书直至清末,才由杨守敬在《日本访书志》中谈及,并指出此书盖为诗文声病而作。后来虽然罗根泽、郭绍虞等前辈学者对《文镜秘 Japanese monk Kong Hai (774-835), with Japan’s 17th Tang sent envoys to Tang, after returning home should be “a multigenerational” request, has written “Manchu secret government theory” a book, the book retained a large number of six dynasties to Tang On behalf of the important literature. However, until the end of the Qing dynasty, this book was discussed by Yang Shou-jing in “Japan’s Book Records” and pointed out that this book was written as a poem. Later, although Luo Genze, Guo Shaoyu other scholars on the "text mirror secret