Conventional study of green communication mainly focuses on the transmission power adjustment to minimize the total power consumption while guaranteeing a target system capacity. However, for the energy efficient design the dynamic transmission mode is an effective way to reduce total transmission power in multiuser networks. In this paper, an energy efficient traffic transmission scheme based on user convergence behavior (UCB) is proposed which characterizes the phenomenon of similar/convergent users' traffic requests during a certain timewindow. First a system model is built to study the relations of user convergence, length of time-window and transmission power consumption. Specifically in each time-window the transmitter analyzes the similarity of users' traffic requests and the similar traffics will be transmitted by multicast mode while the other traffics will be transmitted using unicast mode. To analyze the performance of our scheme, we establish a simple stochastic model in which locations and density of users, wireless channel conditions and transmitting mode are considered. Analytical results, such as power reduction ratio and energy efficiency (EE) of the proposed scheme, are developed, from which the quantitative relationship between UCB and the energy conservation can be obtained. Simulation results validate the theoretical analysis and demonstrate that our scheme can potentially lead to 35% power consumption deduction compared with the conventional transmission scheme.