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In wireless sensor networks, the Media Access Control (MAC) Protocol is one of the key. Network Protocols designed to ensure the normal network communications. Compared with the traditional MAC Protocol, limited battery energy on sensors determines the sensor network MAC Protocol to be energy-efficient of the Primary design goal This Paper Proposes a contention window adaptive MAC protocol based traffic queue, the QA-MAC protocol, which is based on sensor MAC (SMAC) protocol, adaptive adjustment of contention window size according to current traffic queue size and Varying, Our simulated result shows that comparing with existing S-MAC protocols, QA-MAC obtains 28.7% energy savings. This method is especially suitable for high-speed network.