Abstract
This study is intended to explore the tendency of interior design which have sustained the periodic changes throughout the history. After analysis of changes in interior design from 1920's early modernism to nowadays, the conclusion is as follows. In view of the human psychology, the main trend of consistent periodic changes is the revolutionary change of tension and relaxation, and the pursuit of such a change in design is rooted in the human basic need to get the vital energy through stimuli by giving and taking the variety in the public society.