Entropy Weight Method for Evaluation of Invulnerability in Instant Messaging Network

The analysis of complex network invulnerability includes empirical analysis and simulation analysis; there are many disputes on its measure method. Those methods can't quantitatively describe the invulnerability of Network Topology. The paper analyzes the current measure methods of complex network invulnerability, measures the reliability and the invulnerability of instant messaging network topology by analytic hierarchy process, then the paper presents the main influencing factors of instant messaging network topology, constructs the evaluation index matrix, determines the weights of every indexes by the entropy weight method.