Shopping search engine can be understood as a subdivision of the search engine, which is a professional search engine in the field of online shopping. Shopping search engine is developed from the comparison shopping site, comparison shopping originally conceived, is to provide comparative data of commodity price, website reputation, shopping convenience etc. from a variety of online retail websites for consumers, along with the development of the comparison shopping website, its role not only in providing convenience for online consumers, but also provide the opportunity to promote products for online sales, in fact it is similar to a search engine function, and is in need of online shopping, from the comparison shopping website to get the search results than the general search engine to obtain information more focused, more comprehensive information (such as some comparison shopping site in addition to the value of the product information. Also includes the evaluation of online vendors, etc.) and comparison shopping site has gradually evolved into a shopping search engine Qing.