With the development of diversified enterprises, the information resources of diversified enterprises are increasing. Information resources integration is the necessary part of diversified enterprises informatization. This paper sets out from nature of enterprise information resources integration, combining with the characteristics of the diversified enterprises, this paper analyses the superiorities and contents of the diversified enterprises’ information resources integration based on ERP. On the basis of relevant materials and understanding the status and major issues of diversified enterprises’ information resources integration, this paper synthetically analyzes the manner of the diversified enterprises’ information resources integration based on ERP, finally proposes some solutions for the information resources integration of diversified enterprises. By Analyzing of the actual example, the paper raises the direction of development about the information resources integration of diversified enterprises based on ERP.