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AbstractIn heterogeneous network, a large number of business USES the TCP protocol to transmit, but when the TCP protocol is applied to heterogeneous network, QoS can not be guaranteed. Specifically, on one hand, the TCP protocol and the wireless network are less adaptable, leading to the increase of packet loss rate and the decrease of throughput. On the other hand, the TCP protocol does not prioritize business and does not guarantee high priority business requirements. Therefore, the article proposes a TCP protocol (QoS - Internet Predator based on Prey Model, Q-IPPM) that safeguards business in heterogeneous networks. The q-ippm algorithm not only improves the congestion control architecture of TCP protocol based on the bandwidth of heterogeneous network, but also controls different traffic ratio according to different business load conditions and priority level. The experimental results show that the Q-IPPM algorithm not only can significantly increase the throughput of heterogeneous network, reduce the network packet loss rate, can also according to the business priorities and load status will be bandwidth "to each according to his need" to different business, to ensure the QoS in heterogeneous network environment of the business.