A method for deploying a network service, comprising: obtaining, by a primary orchestrator, a network service instantiation request, wherein the network service instantiation request is used to request the primary orchestrator to instantiate the network service; obtaining, by the primary orchestrator, network service description information across orchestrator management domains; determining, by the primary orchestrator according to the network service description information, a first virtualized network function that needs to be deployed in a management domain of a secondary orchestrator; and sending, by the primary orchestrator, a virtualized network function instantiation request to the secondary orchestrator, wherein the virtualized network function instantiation request is used to request the secondary orchestrator to instantiate the first virtualized network function, wherein a management domain of the primary orchestrator is different from the management domain of the secondary orchestrator, wherein after the sending, by the primary orchestrator, a virtualized network function instantiation request to the secondary orchestrator, the method further comprises: receiving, by the primary orchestrator, a lifecycle management operation request sent by the secondary orchestrator, wherein the lifecycle management operation request is used to request to manage a lifecycle of the instantiated first virtualized network function; and sending, by the primary orchestrator, a lifecycle management operation request acknowledgment message to the secondary orchestrator, wherein after the sending a virtualized network function instantiation request to the secondary orchestrator, the method further comprises: sending, by the primary orchestrator, lifecycle management policy information to the secondary orchestrator, wherein the lifecycle management policy information is used to describe permission of the secondary orchestrator to perform a lifecycle management operation on the first virtualized network function. obtaining, by a primary orchestrator, a network service instantiation request, wherein the network service instantiation request is used to request the primary orchestrator to instantiate the network service; obtaining, by the primary orchestrator, network service description information across orchestrator management domains; determining, by the primary orchestrator according to the network service description information, a first virtualized network function that needs to be deployed in a management domain of a secondary orchestrator; and sending, by the primary orchestrator, a virtualized network function instantiation request to the secondary orchestrator, wherein the virtualized network function instantiation request is used to request the secondary orchestrator to instantiate the first virtualized network function, wherein a management domain of the primary orchestrator is different from the management domain of the secondary orchestrator, wherein after the sending, by the primary orchestrator, a virtualized network function instantiation request to the secondary orchestrator, the method further comprises: receiving, by the primary orchestrator, a lifecycle management operation request sent by the secondary orchestrator, wherein the lifecycle management operation request is used to request to manage a lifecycle of the instantiated first virtualized network function; and sending, by the primary orchestrator, a lifecycle management operation request acknowledgment message to the secondary orchestrator, receiving, by the primary orchestrator, a lifecycle management operation request sent by the secondary orchestrator, wherein the lifecycle management operation request is used to request to manage a lifecycle of the instantiated first virtualized network function; and sending, by the primary orchestrator, a lifecycle management operation request acknowledgment message to the secondary orchestrator, wherein after the sending a virtualized network function instantiation request to the secondary orchestrator, the method further comprises: sending, by the primary orchestrator, lifecycle management policy information to the secondary orchestrator, wherein the lifecycle management policy information is used to describe permission of the secondary orchestrator to perform a lifecycle management operation on the first virtualized network function.