Robust　digital　watermarking　of　three-dimensional　models　is　a　effective　means　to　copyright　protection,　which　was　studied　in　recent　years,　this　paper　proposed　a　DCT-based　dual　watermarking　algorithm　for　Three-Dimensional　mesh　models,　Semi-fragile　watermark　signal　1　was　used　to　model　tampering　detection　and　localization,　which　was　transformed　the　angel　between　vectors(from　center　of　gravity　to　each　vertex)　and　Z　Axis;　Fingerprint　was　selected　in　this　paper　as　the　robustness　watermark　signal　2,　which　identified　author＇s　copyright　information.　The　experimental　results　showed　that　the　watermarking　algorithm　can　resist　all　sorts　of　geometry　attack,　cutting,　and　noise,　moreover,　it　has　a　better　watermark　transparency.　©　2012　IEEE.