This paper proposed to digital watermarking technique for architectural design drawing using LINEs and ARCs based on vertex in CAD system to prevent infringement of copyright from unlawfulness reproductions and distribution. After extract LINEs and ARCs from designed drawing, we embed watermarks using adaptive algorithm in each characteristics. Watermarks robust to various attacks like as geometrical transformation as being embedded in LINE’s length and ARC’s angle information. Also, the proposed method satisfies enough transparency about watermarked drawing because have suitable embedding strength to each component. Because handlings that are regarded as attacks of watermarked drawing can consist in CAD program, it used AutoCAD 2002 that is common using as a CAD program for experiments. By experimental result, we confirmed robustness and invisibility of embedded watermarks in several conversions of architectural design drawing.