This poper descrihes a method for linking the AUTOCAD Drafing Package ('AUTOCAD'). a well-known computer-aided design sofrware package for arehiteets, with an acoustic ray-tracing program, in detail. Two application ptograms. EXTATTDX and EXTVERTE. have been worked out to retrive useful information for a ray-tracing program from the drawing files of AUTOCAD. The flow chart of the EXTATTDXD program and some application examples are given. This linking not only speeds up the acousties andalysis proeess for a rariety of halls, but also enables us to test the acoustic properties for buildingx at design stage. The retriered information can also be used for other application purposes.