With the development of WWW (World Wide Web), more and more people surf on the Web, more and more Web sites provide forum for people to publish their reviews, so there are many reviews on some special topic in many forums. Our system mainly aims at the reviews of customer for some product. The data set comes from forum data or emails or any other form of reviews. The mining result can guide the company's CEO to make science decision for company's products research and market development and the mining result can guide the customers to purchase more satisfying products. Our system mainly adopts data mining technology, natural language processing technology, Web text mining technology and so on. In the realization of our system, we adopt role based concepts and theory, this makes the realization more reasonable and more efficiency and this makes the system function more perfect and more science.