In this study, the four methods of painted in painting hidden method. Invisible ink, infrared, and halftone hidden technology, the completion of archives printing, After the printing scan is printed, this study is mainly comparable to analysis of the four hidden technical, original printing and copy printing authentic identification, Experimental results, Invisible ink, infrared hidden technology hidden information will appear, SIRDS and halftone hidden technology hidden information will disappear, without increasing additional cost consideration, adoption Infrared hidden technology and halftone hidden technology.