For IT enterprises, it has become a common concern that how to use all kinds of social networks relationship, value networks relationship, customer networks relationship, and knowledge networks relationship rationally to establish a better social image, access more social resources, reduce business transaction costs, and improve governance efficiency.

After analyzing the value of financial sector,customer and relationship network derived from the former two things,this paper discusses the significance of cross-selling in enhaning the value of relationship network.

Applying evolutionary game theory to an enterprise cooperative competition mechanism in a value network;

Strategic alliance based on value network;

Output advantages based on value network for enterprises: characteristics and formation;

The paper develops a basic frame for profit optimization based on the value net theory: determines the value to the customer, the risk discounted value and market power, finds the market power limited price ceiling and optimal profit-volume combination.

Competition gets fierce from between corporation to value net.

In this paper, the problems existed in Metcalfe′s law for describing network externalities and estimating network value are analyzed, which lead to a serious of failure in network economy.