The old books which have been colored to brown spots were analyzed chemically to compare with white part. The original raw materials were paper mulberry (Broussonetia Kazine) and woodpulp. White part contained58.8%($alpha$-37.2%,$eta$-8.6%, $gamma$-12.7%)cellulose, 21.7% hemicellulose, 19.8% lignin,4.4% pentosan and brown sopt part contained 49.1%($alpha$-19.8%, $eta$-14.5%,$gamma$-14.8%) cellulose, 27.1% hemicellulose, 23.8% lignin, 4.8% pentosan. Both of brown spot and white parts contained starch without protein. The pH was 4.9 in brown and 5.0 in white part respecitively. The brown spot parts were more solidified than white parts according to SEM observation. Difference of organiccompinent in brown part came from white part were 2-hydroxy-benzaldehydeand phenol.