The transcriptions were made in the 12th century but some sutras dating back to the 11th century and containing end-paper illustrations are included, and these are believed to have been added to make up for those scrolls that were lost while the collection was being transported.
書写年代は12世紀であるが、一部に11世紀にさかのぼる見返し絵を持つ経典が混入しており、これは伝来の途上で失われた経巻を、由来の異なる他経で補ったものとされている。