A method for tunnel mapping in a Next Generation Network based on Multi-Protocol Label Switch Traffic Engineering, MPLS-TE, characterized by comprising steps of: sending, by a policy decision function entity, PD-FE, or other entities, a resource information request of a service data stream to a transport resource control function entity, TRC-FE; according to the resource information request received, selecting, by the TRC-FE, a corresponding LSP tunnel and completing allocation of the service data stream; after completing the allocation of the service data stream, instructing, by the TRC-FE through a Rn interface, a transport resource enforcement function entity, TRE-FE, of a head node of the LSP tunnel to map the service data stream to the LSP tunnel, the instruction further carries information of an IP 5-tuple of said service data stream and the allocated LSP tunnel; updating, by the TRE-FE of the LSP head node, a stream label mapping table, creating an entry of the mapping between the service data stream and the LSP tunnel, and mapping the service data stream to the LSP when the service data stream reaches the head note, creating, by said TRE-FE, a stream label mapping table according to said instruction if there is no stream label mapping table; when the service data stream is suspended, sending, by the PD-FE or other entities, a service suspension message to the TRC-FE; according to the service suspension message, finding, by the TRC-FE, the LSP head node to which the service data stream is allocated; through the interface Rn, instructing, by the TRC-FE, the TRE-FE of the LSP head node to cancel the mapping of the service data stream to the LSP tunnel, the instruction further carries information of an IP 5-tuple of said service data stream and the allocated LSP tunnel; updating, by the TRE-FE of the LSP head node, the stream label mapping table, deleting the entry of the mapping between the service data stream and the LSP tunnel, and restoring the service data stream to an original state. sending, by a policy decision function entity, PD-FE, or other entities, a resource information request of a service data stream to a transport resource control function entity, TRC-FE; according to the resource information request received, selecting, by the TRC-FE, a corresponding LSP tunnel and completing allocation of the service data stream; after completing the allocation of the service data stream, instructing, by the TRC-FE through a Rn interface, a transport resource enforcement function entity, TRE-FE, of a head node of the LSP tunnel to map the service data stream to the LSP tunnel, the instruction further carries information of an IP 5-tuple of said service data stream and the allocated LSP tunnel; updating, by the TRE-FE of the LSP head node, a stream label mapping table, creating an entry of the mapping between the service data stream and the LSP tunnel, and mapping the service data stream to the LSP when the service data stream reaches the head note, creating, by said TRE-FE, a stream label mapping table according to said instruction if there is no stream label mapping table; when the service data stream is suspended, sending, by the PD-FE or other entities, a service suspension message to the TRC-FE; according to the service suspension message, finding, by the TRC-FE, the LSP head node to which the service data stream is allocated; through the interface Rn, instructing, by the TRC-FE, the TRE-FE of the LSP head node to cancel the mapping of the service data stream to the LSP tunnel, the instruction further carries information of an IP 5-tuple of said service data stream and the allocated LSP tunnel; updating, by the TRE-FE of the LSP head node, the stream label mapping table, deleting the entry of the mapping between the service data stream and the LSP tunnel, and restoring the service data stream to an original state.