A network overload control method, comprising: after acquiring that a target area is overloaded, a registration server adding a node into the target area; wherein, the step of adding the node into the target area comprises: the registration server selecting a node from a network area outside the target area, and adding the selected node into the target area; wherein, the step of selecting a node from a network area outside of the target area and adding the selected node into the target area, comprises: the registration server selecting from a network area outside of the target area one or more nodes whose loads are less than a reference load in the target area, or one or more nodes whose loads are less than a first load threshold; the registration server notifying the selected node to re-join the network, and after receiving a network join request message sent by the selected node, assigning a node identifier to the selected node, and the assigned node identifier making the selected node share with the target area the bearers in the address space of the target area after the selected node joins the network, so as to decompose the load in the target area. after acquiring that a target area is overloaded, a registration server adding a node into the target area; wherein, the step of adding the node into the target area comprises: the registration server selecting a node from a network area outside the target area, and adding the selected node into the target area; wherein, the step of selecting a node from a network area outside of the target area and adding the selected node into the target area, comprises: the registration server selecting from a network area outside of the target area one or more nodes whose loads are less than a reference load in the target area, or one or more nodes whose loads are less than a first load threshold; the registration server notifying the selected node to re-join the network, and after receiving a network join request message sent by the selected node, assigning a node identifier to the selected node, and the assigned node identifier making the selected node share with the target area the bearers in the address space of the target area after the selected node joins the network, so as to decompose the load in the target area. the registration server selecting a node from a network area outside the target area, and adding the selected node into the target area; wherein, the step of selecting a node from a network area outside of the target area and adding the selected node into the target area, comprises: the registration server selecting from a network area outside of the target area one or more nodes whose loads are less than a reference load in the target area, or one or more nodes whose loads are less than a first load threshold; the registration server notifying the selected node to re-join the network, and after receiving a network join request message sent by the selected node, assigning a node identifier to the selected node, and the assigned node identifier making the selected node share with the target area the bearers in the address space of the target area after the selected node joins the network, so as to decompose the load in the target area.