To study marketing strategy changes caused by Korea fashion industry development process, the fashion marketing strategy changes of Japan, considered as the most similar one of Korea, was compared. At each period, p! roper cost efficiency strategies, product differentiation strategies, and market segment strategies has been selected and applied. The fashion industry foundation period namely practical usage clothing period of Korea follows 10 years after one of Japan. 90`s highly sensitive fashion period namely fashion industry growth period follows 5 years after one of Japan. As entering to fashion industry maturity period with global competition, the time difference falls to less than 5 years. With hosting of 2002`s World-Cup, Korea`s global competitiveness has increased, and it appears to be possible of being fashion market leader in East Asia and Japan`s rival on an equal footing.