THE AIM OF THIS ARTICLE IS TO REEXAMINE DISTRICT IMPROVEMENT WHICH HAS BEEN POPULAR IN THE 1970S' AND 1980S’ IN JAPAN. THIS THEORY WAS PROPOSED TO IMPROVE LOW-RISE AND HIGH-DENSITY BUILT-UP AREA, WHICH HAD BEEN FORMED AROUND THE CENTRAL AREA. IN THIS ARTICLE, THE FOLLOWINGS ARE DISCUSSED; 1) ON THE DEFINITION OF DISTRICT IMPROVEMENT, 2)ON THE POSITION OF IMPROVEMENT IN THE URBAN RENEWAL THEORY, 3) ON THE PRACTICAL ASPECTS OF IMPROVEMENT. AFTER THESE BASIC EXAMINATION BOTH ON THEORY AND PRACTICE, THE FRAMEWORK OF NEW RENEWAL THEORY WOULD BE PRESENTED.
