The invention discloses a flow control method. The method comprises the following steps: a user strategy is sent to a first network element of a mobile network by a mobile node through a routing request RS message; and a neighbour request message sent by the first network element is received by the mobile node, wherein the neighbour request message includes traffic flow migration strategy information assigned by a second network element of the mobile network to the mobile node. The invention further discloses a flow control device, an access gateway and a mobile node. The second network element of the invention can acquire the user strategy of the MN, decide traffic flow uplink and downlink transmission paths according to the user strategy, and send uplink traffic flow routing information to the MN to make the mobile node uplink and downlink traffic flow transmission paths controlled by the network side so as to realize the network side intelligent flow control.