A policy control method for a user session, the method comprises: according to policy trigger information, acquiring, by a policy server, an aggregated operation that is corresponding to the policy trigger information and is used for performing policy control on a group of user sessions, wherein the aggregated operation comprises an operation rule corresponding to the policy control and a condition parameter that is used for determining, by a gateway device, the group of user sessions, wherein the policy server is a Policy and Charging Rules Function, PCRF, and the gateway device is a gateway device that includes a Policy and Charging Enforcement Function, PCEF, or a Bearer Binding and Event Report Function, BBERF; and sending, by the policy server, a first service message that comprises the aggregated operation to the gateway device, so that the gateway device determines the group of user sessions according to the condition parameter and executes an operation on the group of user sessions according to the operation rule, wherein the condition parameter includes QoS Class Identifier, QCI, uplink/downlink bandwidth, Allocation Retention Priority, ARP, or Packet Data Network, PDN, information, or a combination of them, wherein the sending the first service message that comprises the aggregated operation to the gateway device comprises: sending a service message that comprises the aggregated operation and is corresponding to a newly established dedicated session to the gateway device, wherein before the sending the service message that comprises the aggregated operation and is corresponding to the newly established dedicated session to the gateway device, the method further comprises: receiving a first request message sent by the gateway device, wherein the first request message is used for requesting establishing the dedicated session used for transmitting the aggregated operation, and the first request message comprises a dedicated request ID and a dedicated session ID that are used for identifying the dedicated session; and storing the dedicated application ID and dedicated session ID; the service message that comprises the aggregated operation and is corresponding to the newly established dedicated session comprises the aggregated operation, dedicated application ID, and dedicated session ID. according to policy trigger information, acquiring, by a policy server, an aggregated operation that is corresponding to the policy trigger information and is used for performing policy control on a group of user sessions, wherein the aggregated operation comprises an operation rule corresponding to the policy control and a condition parameter that is used for determining, by a gateway device, the group of user sessions, wherein the policy server is a Policy and Charging Rules Function, PCRF, and the gateway device is a gateway device that includes a Policy and Charging Enforcement Function, PCEF, or a Bearer Binding and Event Report Function, BBERF; and sending, by the policy server, a first service message that comprises the aggregated operation to the gateway device, so that the gateway device determines the group of user sessions according to the condition parameter and executes an operation on the group of user sessions according to the operation rule, wherein the condition parameter includes QoS Class Identifier, QCI, uplink/downlink bandwidth, Allocation Retention Priority, ARP, or Packet Data Network, PDN, information, or a combination of them, wherein the sending the first service message that comprises the aggregated operation to the gateway device comprises: sending a service message that comprises the aggregated operation and is corresponding to a newly established dedicated session to the gateway device, sending a service message that comprises the aggregated operation and is corresponding to a newly established dedicated session to the gateway device, wherein before the sending the service message that comprises the aggregated operation and is corresponding to the newly established dedicated session to the gateway device, the method further comprises: receiving a first request message sent by the gateway device, wherein the first request message is used for requesting establishing the dedicated session used for transmitting the aggregated operation, and the first request message comprises a dedicated request ID and a dedicated session ID that are used for identifying the dedicated session; and storing the dedicated application ID and dedicated session ID; the service message that comprises the aggregated operation and is corresponding to the newly established dedicated session comprises the aggregated operation, dedicated application ID, and dedicated session ID. receiving a first request message sent by the gateway device, wherein the first request message is used for requesting establishing the dedicated session used for transmitting the aggregated operation, and the first request message comprises a dedicated request ID and a dedicated session ID that are used for identifying the dedicated session; and storing the dedicated application ID and dedicated session ID; the service message that comprises the aggregated operation and is corresponding to the newly established dedicated session comprises the aggregated operation, dedicated application ID, and dedicated session ID.