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In modern data centers,power consumed by network is an observable portion of the total energy budget and thus improving the energy efficiency of data center networks (DCNs) truly matters.One effective way for this energy efficiency is to make the size of DCNs elastic along with traffic demands by flow consolidation and bandwidth scheduling,i.e.,turning off unnecessary network components to reduce the power consumption.Meanwhile,having the instinct support for data center management,software defined networking (SDN) provides a paradigm to elastically control the resources of DCNs.To achieve such power savings,most of the prior efforts just adopt simple greedy heuristic to reduce computational complexity.However,due to the inherent problem of greedy algorithm,a good-enough optimization cannot be always guaranteed.To address this problem,a modified hybrid genetic algorithm (MHGA) is employed to improve the solution\'s accuracy,and the fine-grained routing function of SDN is fully leveraged.The simulation results show that more efficient power management can be achieved than the previous studies,by increasing about 5％ of network energy savings.