This paper aims to clarify how to form Civic Center in Castle area in relation to Castle-Towns basis analyzing cases of prefectural capital 17 Cities based on Japanese Castle-Towns from Meiji and Taisho era to the early Showa era. Findings are as follows: 1) Government and municipal offices tended to be dispersed, 2) The whole government and municipal offices tended to be located outside Castle area, but those which formed Civic Center tended to be located inside Castle area, 3) Paying attention to "Class" and "Axis" as space elements of making Castle area, as a result of analyzing relationship between those and Civic Center, we discover various Urban Design method of Civic Center such as Discrimination by locating Prefectural office in the site of the main enclosure of a castle and making identified and symbolic Urban Space by locating government and municipal offices together along moat or skirts of a mountain or main streets.