This paper considered the enforcement process of original urban plan formed before World War 2 and the continuity to urban planning afterwards from a case study of Nagano Toshikeikaku Planning from 1930 to 1969. Original plan by Hiroyoshi Yamada had been followed generally from 1930 to 1945 but had been added the planning alteration with the defeat of the war and 2 times consolidations of municipalities as turning points. The factors of planning alterations are industrial advance, magnification of administrative area by consolidations, motorization and developments disorderly into planned areas. The continuity of original plan can be recognized the continuation of the concept of sightseeing city, streets-system plan of ring roads and land use zoning.