The invention discloses an MPLS (Multi-Protocol Label Switching) three-layer VPN (Virtual Private Network) service management optimization system and method and relates to the field of data and IP (Internet Protocol) transmission equipment. The method comprises the following steps: constructing an NHLFE (Next Hop Label Forwarding Entry) tree, a bound tree and an unbound tree, and managing an NHLFE and an LSP (Label Switched Path) bound with the NHLFE, wherein when the LSP is firstly generated and then the NHLFE is generated, the NHLFE selects the LSP for binding according to a binding principle; if the NHLFE is firstly generated, the LSP which does not satisfy the binding principle cannot be bound, and only after the LSP is generated, binding is conducted; when the NHLFE and the LSP have already been generated and bound, if a preferred LSP is generated, a modification is made to bind to the preferred LSP; when the NHLFE and the LSP have already been generated and bound, if the bound LSP is deleted, the NHLFE selects a suboptimum LSP for binding; if no available LSP exists, the NHLFE terminates the binding relation with the LSP. The MPLS three-layer VPN service management optimization system and method have the advantages that since binding relations between the NHLFEs and the LSPs which need to be updated are only processed, the occupied system resources can be effectively reduced and the service switching is accelerated.