Bag industry in Taiwan has been not only a conventional industry for decades, but world-famous for the high quality. R.O.C. obtained lots of foreign exchange from the superb crafts at the time. In addition to carefully manufacturing, bagpattern making ability is also an important skill to an exquisite bag. Although it has been developed for a long time, but the real situationislittle books written about bag-pattern making or few related researches could be found. This study probed into the leather bag-pattern making ability. First, we described the present status and history development of bag industry in Taiwan by documentary analysis. Then, archived the glossaries, pattern making specifications and precautions of leather-bags professional knowledge in this industry. We expect that it would be helpful to who interested in bag design and manufacture.