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Characteristics of tactical guarantee network are analyzed, based on which a network model with uniformly random degree distribution and cascade failure survivability model is proposed. Supposing network nodes' initial capacity and load were equal, the critical point of network cascade collapse is derived by probability function method analysis. The research shows that: as network load increases, there will be a critical load value. When network load exceeds the critical value, a random node failure in the network will cause the entire function network to collapse. Finally, computer simulation is applied to verify the correctness of the analytic deduction.