A method for controlling establishment of a local IP access, comprising: when an access gateway determines that data or an application of a terminal needs to be offloaded, the access gateway informing the terminal that a local IP connection needs to be established via a mobility management entity and a radio side network element by a bearer modification, or the access gateway informing the radio side network element or a local gateway of a routing policy via the mobility management entity (803, 804, 805, 806); wherein the radio side network element is a base station, a Home eNodeB, a radio network controller, RNC, a Home eNodeB gateway, or a traffic offload function entity; the mobility management entity is a mobility management element, MME, a mobile switching center, MSC, or a Serving General Packet Radio Service,GPRS, support node, SGSN; the access gateway is a packet data network gateway, PGW, or a gateway GPRS support node,GGSN; the local gateway is a local serving gateway, L-SGW, and a local packet data network gateway, L-PGW; or a separate L-PGW; or a local gateway GPRS support node, L-GGSN and a Local Serving GPRS Support Node, L-SGSN; or a separate L-GGSN; or a traffic offload function entity; wherein, the access gateway determines that data or application of the terminal needs to be offloaded by one of or a combination of following modes: the terminal initiating data or application, the access gateway finding out that messages of that type of data or application need to be offloaded through a deep packet inspection; or, the access gateway finding out that load is too heavy according to traffic information, and then determining that a certain type of data or application possessed by the terminal is offloaded according to a local policy; or, a Policy and Charging Rules Function, PCRF, informing the access gateway that data or application needs to be offloaded and/or informing the access gateway of modified policy and charging control, PCC, rules; or, the access gateway finding out that the mobility management entity changes. when an access gateway determines that data or an application of a terminal needs to be offloaded, the access gateway informing the terminal that a local IP connection needs to be established via a mobility management entity and a radio side network element by a bearer modification, or the access gateway informing the radio side network element or a local gateway of a routing policy via the mobility management entity (803, 804, 805, 806); wherein the radio side network element is a base station, a Home eNodeB, a radio network controller, RNC, a Home eNodeB gateway, or a traffic offload function entity; the mobility management entity is a mobility management element, MME, a mobile switching center, MSC, or a Serving General Packet Radio Service,GPRS, support node, SGSN; the access gateway is a packet data network gateway, PGW, or a gateway GPRS support node,GGSN; the local gateway is a local serving gateway, L-SGW, and a local packet data network gateway, L-PGW; or a separate L-PGW; or a local gateway GPRS support node, L-GGSN and a Local Serving GPRS Support Node, L-SGSN; or a separate L-GGSN; or a traffic offload function entity; wherein, the access gateway determines that data or application of the terminal needs to be offloaded by one of or a combination of following modes: the terminal initiating data or application, the access gateway finding out that messages of that type of data or application need to be offloaded through a deep packet inspection; or, the access gateway finding out that load is too heavy according to traffic information, and then determining that a certain type of data or application possessed by the terminal is offloaded according to a local policy; or, a Policy and Charging Rules Function, PCRF, informing the access gateway that data or application needs to be offloaded and/or informing the access gateway of modified policy and charging control, PCC, rules; or, the access gateway finding out that the mobility management entity changes. the terminal initiating data or application, the access gateway finding out that messages of that type of data or application need to be offloaded through a deep packet inspection; or, the access gateway finding out that load is too heavy according to traffic information, and then determining that a certain type of data or application possessed by the terminal is offloaded according to a local policy; or, a Policy and Charging Rules Function, PCRF, informing the access gateway that data or application needs to be offloaded and/or informing the access gateway of modified policy and charging control, PCC, rules; or, the access gateway finding out that the mobility management entity changes.