Professional markets are a kind of institutional arrangements. Their evolution may experience simple trade models, small-scale market models, primary professional market models, typical professional markets and segmented market models. Different market models are the result of both parties pursuing trade efficiency and low costs. Under the same circumstances, professional markets, as a platform, can help raise trade efficiency and reduce trade costs. The emergence of segmented market models means that professional markets, as a trade platform, have entered an ebb phase and must need transforming and upgrading. There are three characteristics in achieving upgrades. Firstly, service is transformed from an auxiliary function into a dominant one and developed into clusters for main service bodies. Secondly, the professionalized division of labor in each trade link keeps dividing. The division changes from vertical link division to horizontal functional one, which has become a mainstream. Thirdly, the focus of market trading shifts from the usual trade of merchandise to trade of merchandise as well as service.