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Abstract: Generally, most people think that the authenticity of a document depends on the authenticity of signatures on that document. But when it comes to forensic practice, they are not the same. There are many ways to utilize genuine signatures to forge a document. Because of the authenticity of the signature, forensic examiners tend to draw a false conclusion if they neglect to inspect the questioned document systematically. According to the distinct features of different forgeries, background analysis, detail feature comparison, image analysis, instrumental analysis and systematic inspection method should be applied comprehensively. In addition, attentions ought to be paid to matters like whether the questioned document is original or not, the focus contradictions of both parties, and whether the signatures are genuine or imitated.

Key words:  handwriting, forged document, page replacement, system inspection