Nowadays conmpetltlOn of developing new products is getting keen. We can notice that the role and importance of design are emphasized more than ever.The main cause of this tendency is that technical power is no more a factor which secures the superiority in products competition, as technology is gneneralized in the world. Therefore, design is recognized intensely as a competitive strategy to promote competitive power of products. It is an already known fact that the design for both rational function and charming form to satisfy consumer's desires is a short cut to success, when a company develops a new product to promote competitive power in market. The design which plays a leading role in the activity of developing more cnovenient, more economical and more aesthetic products is called 'Competitive Edge' or 'New Corporate Weapon'. Judging form each company's case of developing products, we can guess that it has its own plan and process of developing new products with defferdnl interest and effort. The strategy of developing products is considered as the most important factor that affects the very existence of rhe company. This thesis is composed of six chapters in all. In the firstchapter, I describe the purpose, method, and scope of study.The second chapter includes the image of form in oil fan heater market in nearby Japan and that of interior in our domestic home and shops, and the trend of word life cycle by analyzing circumstances. The third chapter focuses on consumer's attitude. In the fourth chapter, I compare and test current products of competitive companies including Samsung, Daewoo, Shinilwith those of Gold STar. The trend of products, technique, and design which resulted form this comparison is described. In the fifth chapter I explain the strategy, and process of design of oil fan heater in 1992. The last conclusive chapter presents the major point drawed form the case study, but not includes an estimation of products and the condition of market. In this thesis, I reconsider the general understanding of design and designing process and the value of design as a main factor in the strategy of management by investigating the development of products and the strategy of design, and the process of design.