Abstract: By analyzing the relationships between enterprises diversified management and production cost and coordination cost, this article builds the analysis model of the effects of diversification on corporation performance. It is concluded that related diversified operations can both improve and bring down performance. Moderate diversified management will make enterprises realize economies of scope and improve the performance，while immoderate diversified management will make enterprise diseconomies of scope and lower the performance. Unrelated diversification will bring down the performance. The correlation between products of diversified enterprises is directly proportional to enterprise performance. The widespread use of modern information technology enhances the diversified management enterprise.

Key words: enterprisediversification, informatization, economiesofscope, firmperformance