Abstract: To protect the copyright of three dimensional meshes, non-watermark algorithm constructs marking watermark by the characteristic structure of three dimensional meshes instead of embedding watermark by altering the data of three dimensional meshes.The proposed method compromise the robustness and transparency of watermarked three dimensional meshes.Experimental results show the proposed method is both simple to implement and fairly robust against common mesh attacks such as geometrical transform, mesh simplification, mesh cropping, random noise added to the vertex coordinates etc.