This Study aims to clarify the problem of shrinking specified area by Ordinance 3411 as case study of Saitama Prefecture. As a result, we clarify the following and propose the suitable method to shrink the area. 1) While there are local authorities which widely shrink specified area by Ordinance 3411, there are also local authorities which resist shrinking the area. 2) In Kazo City which did not shrink this area, as the city refused to strengthen the land use regulation once loosened, it

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... the management policy more flexible than other local authorities. 3) Since a management policy was not reformed about the area where a disaster risk is high, the effect of shrinking specified area by Ordinance 3411 was restrictive.