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The sensor nodes of Wireless Sensor Networks have limited battery power, so energy efficiency is mainly considered in the design. A novel mechanism of cluster head operation is designed for reducing the energy consumption for broadcasting message and prolonging the network lifetime. The key of the mechanism is that each cluster head acts continuously as local control center and will not be replaced by the candidate cluster head until its operation times reach its optimum value, thus the energy consumption ratio of gathering data to broadcasting message is improved. The simulation results demonstrate that the mechanism can effectively reduce the energy consumption of broadcasting message and prolong the network lifetime.