Information plays a key role in the competition of enterprises.To solve the problem of economic effectiveness about the market demand research and the rival cost research in the enterprise competition, the costs for the acquisition of market demand and the competitor information were considered and an information value model for the enterprise competition was established.Through the Nash game equilibrium discussion on different types of markets and the computer simulation, it is found that different types of products have different information values;getting the full information of market demand and competitor costs is not desirable, and at different stages there are different optimal investment proportion on the market research and the competitor research.The results are of certain guiding significance to how to get more valuable decision information so as to make better pricing and production plans.