This paper examines influence of reconstruction plans for downtown's formation after great fires by focusing fireproof buildings belt's construction process in Odate city, Akita prefecture. Before the great fire in 1953, city and prefecture governments couldn't progress their legal city planning. But fireproof buildings belt, built by a reconstruction plan in 1954, actually protected the great fire in 1956. As a result, citizen's consciousness for fire prevention changed and national, prefecture and city government could promote their plan. It is present basis of Odate city's downtown. Reconstruction planning were useful for re-development of the downtown of Odate city.