This study investigates the development mechanism in Urbanization Control Area (UCA) of Tsukuba City to find the problems of the present development permission system. Problems in UCA are: 1) accumulation of individual development causes land use problem and needs for infrastructure, 2) judgment standard for regulation is ambiguous, 3) regulation for use and shape is too lose. For the improvement of planning system is: 1) selection of the development area in UCA on the base of the master plan for UCA, 2) introduction of district planning system based on the consensus of land owners, 3) appropriate regulation of use and shape in accordance with landscape of UCA.
