Abstract: This paper analyzes the influence of three user behavioral model of Churn (Exponential Distribution model, Pareto Distribution model, and Weibull Distribution model) to structure peer-to-peer network over mobile ad hoc networks.The experiments shows that the main factors which affect the Churn problems of structure peer-to-peer networks over MANETs are: Node session time, network size, network layer routing protocol and node mobilize, and analyzes the relationship between these factors.