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Lowering the energy consumption may result in increase of time delay from end to end in Wireless Sensor Network (WSN). To address the tradeoff between energy consumption and time delay, this paper proposes a Media Access Control (MAC) protocol based on dynamic duty cycle. It adjusts duty cycle dynamically through computing node utilization rate, average sleeping delay, and the upper and lower bound of duty cycle, to adapt the network real-time communication flow. Experimental results show that MAC protocol saves energy about 52 % and reduces latency time 35 % than S-MAC in linear topology. In the reticular topology, it achieves 68 % energy saving and 46 % latency reduction than S-MAC.
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