The " Su-style" costume is the most representative fashion in the late Ming Dynasty. It emerged in Suzhou, the economic and cultural center of the time, and constituted a system of fashion communication system in the center of Suzhou radiating throughout the country, causing a great impact on the aesthetic standards and social mores of the country. The rise and popularity of " Su-style" costume reflected the new changes in various social class forces and the fashion pattern in the late Ming Dynasty, and it was a microcosm of social change in the late Ming Dynasty. By sorting out and analyzing historical documents of the late Ming Dynasty, the article incorporates the changes of costume into the social historiography, in order to illustrate the characteristics of " Su-style" costume and investigate the socio, political, economic and cultural changes reflected by the changes in " Su-style" costume fashion. At the same time, the article uses communication theory to analyze and study the modes of communication of the late Ming clothing fashion. This paper draws the following two important conclusions: 1) The replacement of " Palace,style" by " Su-style" became a fashion model imitated by the masses, indicating that fashion discourse power was highly centralized by the ruling class in the early Ming Dynasty and decentralized to the masses in the late Ming Dynasty, liberating " fashion" from the shackles of the feudal hierarchy and the patterns fashion discourse power tended to become diverse. Unlike the top,down " trickle" spread of the " palace,style", costume fashion dominated by " Su-style" was characterized by a mass communication mode. The change in the mode of communication of fashion in the late Ming Dynasty symbolized the decline of the social custom dominated by state’s will and the weakening of fashion driving force in the vertical dimension. The horizontal flow of " new" goods replacing " old" goods was faster than the vertical spread between upper and lower social classes. At that time, people’s pursuit of fashion was driven more by the psychological mechanisms of pleasure and novelty derived from the consumption of fashion. Fashion consumption constituted an important driving force for the spread of fashion in the late Ming Dynasty. Due to the distribution and trading in all directions, commodities, as the carrier of fashion information, act as a communication medium and the mass consumers act as a recipient of fashion information through the purchase of commodities. 2) With the tide of the commodity economy, the gradual rise of the masses in the late Ming period was also a process in which fashion discourse power was gradually diverted. The fashion discourse power, no longer exclusively owned by one class, which was the result of the joint transformation of clothing by different classes. Along with the downward shift of fashion discourse power, the interaction between the elite and the masses was formed at the core of the connotation of clothing. The connotation of " Su-style" was reconstructed, and the traditional definition of elegance and vulgarity was gradually blurred. The " elegance" and " vulgarity" fused together, representing a new trend in the cultural integration of elegance and vulgarity in the late Ming culture. The article focuses for the first time on the change of discourse power behind the evolution of fashion in the late Ming Dynasty from the fashion phenomenon of " Su-style". The evolvement of fashion discourse power not only provides us with a new perspective and a new point of view on " Su-style" costume, but also reveals the inner impetus of fashion development in the late Ming Dynasty. [ABSTRACT FROM AUTHOR]