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It is necessary that in the small-or-medium-size wireless sensor networks, the networking information of network and monitoring data of sensors should be sent to the remote computers through the gateway to achieve remote monitoring for the target area. Wireless sensor network data characterize strong bursts, instability of traffic and small amount of data in a single packet. Considering these features as well as the bandwidth of wireless network, the paper proposes a Transport Control Protocol (TCP) with an improved Nagle algorithm. The experiments prove that the improved algorithm obviously enhances the utilization of wireless channel and reduces system energy consumption, while it ensures transmission reliability.