Imitation theory is a philosophical fashion theory with a long history and great influence. Although it originated from the West, it also provided important reference value for the development of contemporary fashion culture in China. According to fashion imitation theory, fashion is imitating the “superior” group. The changing process of the criterion of “superior” has witnessed the evolution of imitation theory from trickle-down to trickle-across. The revised imitation theory eliminates the crisis of disconnection between theory and reality, and has a wide interpretation spectrum with rich practical significance. It is not only an important theoretical basis for fashion industry decision-making, but also an effective guidance for the healthy development of modern culture. Only based on rational analysis can fashion guarantee its long-term existence, and promote the harmonious development of contemporary society and culture.