In this paper, systematic ideas are proposed based on construction of the tunnel leakage disaster assessment index system, that is, the possibility prediction on tunnel leakage disaster, grade evaluation on leakage disaster of operation tunnel, tunnel leakage was evaluated by field measurement data, at the same time, this paper took a large number of survey data of china's tunnels as sample, distance discrimination method and BP neural network method were used to predicate and evaluate disaster

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... grade of tunnel leakage. The results showed that the predicted results from the discriminant method and BP neural network evaluation results and measured data evaluation results were consisitent, these provide a theoretical basis for prevention and treatment of tunnel leakage.