With development of web information technologies, internet applications have come into burst growth, which brings different kinds of standard, database and description methods. This condition causes the “information islands” that make a lot of trouble in data sharing. The root cause of these problems is information source heterogeneity, which consists of four levels, and among them the semantic heterogeneity is the most difficult issue. The reasons of semantic heterogeneity existing are pointed out in this article and the research status of heterogeneity elimination is introduced. At last the solutions of agricultural product price information in multi-source network are summarized and the research emphasis in future is prospected.