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In the process of building strong smart grid, the communication technology becomes an important means that supports Intelligrid Architecture. Smart grid has strict requirements in the reliability and real-time performance of communication. MPLS can improve the service quality of power communication. Aiming at the MPLS area, this paper proposes a kind of artificial spider web topology and analyses the invulnerability. Based on this, the OPNET simulation is run for road-balancing and rerouting. The results show that the MPLS routing algorithm has strong ability of road-balancing and rerouting. It can be used to improve the real-time performance of communication. Keywords-smart grid; artificial spider web topology; the degree of invulnerability; MPLS