A data packet processing method, a terminal, and a gateway, where the terminal, determines to transmit network traffic using a first network and a second network simultaneously based on an aggregation flow table, and upon that determination, the terminal sends a quantity of first uplink data packets to the gateway using a first network interface card corresponding to the first network, and sends a quantity of second uplink data packets belonging to the same Transmission Control Protocol (TCP) connection as the first uplink data packets to the gateway using a second network interface card corresponding to the second network, where a source Internet Protocol (IP) address carried in each of the first uplink data packets is the IP address of the first network interface card, and a source IP address carried in each of the second uplink data packets is the IP address of the second network interface card.