It's not doubtful for the Government to take suitable instruments (e.g. urban land consolidation ) to carry out the so-called “integrated development strategy” in urban areas. However, there are many problems due to the financial gap. And more important matter is the issue of the “construction license”. Recently, the issue mentioned above has becomes much more important because of the scope of administration discretion of relative authority in Taiwan. This article therefore focuses on the statutory control degree using §17 of the “Urban Planning Act”. After analyzing, the following can be proposed. 1.The §17 Ⅰ of the “Urban Planning Act” belongs to the statutory administration. As the authority makes the “master plan” in urban areas into notification, the following “detail plan” must be notified in 2 years except an emergency case. That means there exist not any scope for the administration discretion . 2.The §17 Ⅱ of the “Urban Planning Act” belongs to the field of reductíon of administration discretion. If the most infrastructure in urban areas have been finished, the authority has the obligation to give the land-owner an so-called “construction license”. The reason is in the consideration of the “public interest”. In this case, the scope of administration discretion must be reduced to zero in extremely case. 3. The statutory control degree for the §17 of the “Urban Planning Act” should be strengthened due to the regulation of property rights protection in the “Constitution Act”.