The book introduces two main characteristics of the old coins feature; the copper quality and copper color of old coins in acient periods; pack slurry on ancient coins; several identification methods of old coins; the identification of the pre - Qin currency through copper quanlity ; introduces a few forging rust methods; introduces a few forging rust color methods; the general laws to producting pseudo-money; five factors that determine the price of coins; coin market and auction market; coin maintain guidebooks.