1 Introduction
The rapid development of Internet application has greatly increased the information available on the
Internet, causing it difficult to carry out the first step towards E-commerce - ECommerce information retrieval.
The problem how to efficiently retrieves valuable information from huge mounts of information remains to be solved. Traditional information retrieval depends on techniques such as contents, indexes, and keywords, with advantages of being simple and speedy, while the
primary drawback is that those techniques could not mine the inner relationships among information and the retrieval results could not precisely and comprehensively meet user demands.