Contract Net Protocol (CNP) assigns subtasks to agents which are involved in multiagent problem solving. Although the logical aspects of the negotiation protocol have been analyzed, the social behavior of protocol dynamics remain unclear. This paper introduces a quantitative analysis of protocol dynamics, an essential for constructing continuous tea]time applications. We perform an application independent simulation to analyze the social behavior of CNP. We obtain the following results: contractor utilization rate (contractor utility) increases together with the system load while the manager utilization rate (manager utility) decreases; when the number of agents increases, the contractor utility rises while the manager utility does not change; the uniformity of agents causes the concentration of "bids" and "awards," and thus decreases the manager and the contractor utility. Our simulation results are used to analyze the social behavior of Enterprise, a famous CNP application, and point out the inherent problem of Enterprise.