Analysis of the profit model of B2B e-commerce:No.: DZ070 words:116; Page number:16; With the development of social economy and the innovation of Internet and other technologies, e-commerce has become the mainstream means to open up markets, expand business and promote trade. Although e-commerce can be divided into B2B, B2C, C2C and other modes according to transaction objects, B2B e-commerce has become the main body of e-commerce market as far as the whole industry is concerned. From the domestic point of view, although it started late, B2B is the most profitable e-commerce model at present, and whether B2B e-commerce can develop healthily becomes the key to the e-commerce process. Through the analysis of various profit models in B2B e-commerce, this paper finds that although there are nearly 2,000 B2B e-commerce websites of different scales in China, the profit model of B2B is mainly limited to "Alibaba" model, and the profit model of most enterprises is a copy or extension of Ali model. At present, the profit models in the market mainly include membership system, consulting services based on supply and demand information, advertising, e-commerce search and so on. This paper studies various profit models of B2B, analyzes the existing problems and finds out the solutions, so as to better promote the sustainable and healthy development of B2B e-commerce.