This paper conducts a comprehensive analysis on the structural factors and environmental condition factors that influence the longterm safety of the tunnels，and designs a longterm monitoring scheme of tunnels according to relevant norms.The longterm tunnel safety evaluation model based is dcve loped on the tunnel monitoring scheme. For the tunnel structure, this study evaluates the safety ratings with a single index, and develops the multiindex comprehensive evaluation model. As an integrated score, a quinary digit which contains six digits is inducted. Together with the evaluation of safety ratings, it can detailedly reveal the actual safety condition of tunnel structure. As to the tunnel operation, the weight of indexes is confirmed using AHP, and the membership degree of indexes was calculated by trapezoidal distribution membership functions. A fuzzy comprehensive evaluation model of safety is built. This model is applied to evaluate the safety of Jiahua Tunnel, which has achieved a good result.