In recent years, structures using new materials and methods have increased even in historic districts. Creating a target image is especially difficult by the subdivision of sites and the construction of various styles of residences in samurai residence area. Therefore, creating and operating design guidelines have become important subjects. Murakami was created as a castle town in 16th century. Now it is precious area where has samurai residence and preserved by Niigata prefecture. In january, 2000, municipal government enacted "The ordinance to conserve historical townscape" and started operating design control. The purpose of this study is to clarify how a design guideline is operated by the ordinance in Murakami.