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Wireless sensor network is formed by a great deal of sensor nodes, which are generally battery-powered and may not recharge easily. Consequently, how to prolong the lifetime of the nodes is an important issue when designing protocol in wireless sensor network. However, lowering the energy consumption may result in higher latency. To address on such tradeoff, this paper proposes ADC-SMAC to improve S-MAC. ADC-MAC adjusts duty cycle dynamically based on utilization, average sleeping delay, the upper and lower bound of duty cycle. The experiment results show that our proposed ADC-SMAC saves energy about 43% and reduce latency by 65% from S-MAC in a chain topology. In the cross topology, ADC-SMAC also achieves 32%energy saving and 45%latency reduction from S-MAC.