Through　the　combination　of　digital　signature　algorithms　and　integrated　circuit　chips,　the　paper　puts　forwards　a　new　banknote　anti-forgery　method　which　may　be　regarded　as　an　information　system.　The　paper　conceives　the　preliminary　design　of　the　system　which　includes　the　banknote　print-data　editing,　key　management,　signing-code　injection,　and　signing-code　verification　four　modules,　and　describes　the　function　of　every　module.　The　paper　analyzes　the　security　and　effectiveness　of　the　new　method,　discusses　curtly　the　digital　signature　algorithms　with　a　small　modulus,　and　points　out　that　the　thought　of　the　banknote　ami-forgery　system　may　be　extended　to　passport　anti-forgery　for　antiterrorism.