Navigation tunnels can achieve effective connections between navigable buildings under alpine canyon conditions,but the cross-sectional scale of the tunnel is highly correlated with ship navigation characteristics such as ship speed,navigation resistance,and sinking volume,posing a multi-objective optimization problem.This paper uses the RNG k-ε turbulence model and the GMO motion model to perform three-dimensional numerical simulations of the movement process of the 1,000-ton ships in a navigation tunnel,analyzes the spatial-temporal changes of various hydraulic characteristics in the tunnel,explores the effects of the ship’s driving speed and tunnel width on the ship’s traveling wave,lateral flow rate,ship resistance and sinking volume,and presents an empirical formula between the cross-sectional coefficient of the navigation tunnel and the ship’s sinking capacity.The research results show that when the depth of navigation in the tunnel is 5 m,the ship’s driving speed is less than 1.5 m/s,and the tunnel width is greater than 18 m,the solitary wave amplitude of the bow,ship resistance,maximum lateral flow rate and sinking value on both sides of the ship improve markedly.Furthermore,the study also finds an inversely proportional relationship between the ship’s sinking volume and the cross-sectional coefficient of the navigation tunnel.The smaller the navigation tunnel section coefficient,the greater the ship sinks,Moreover,the navigational water depth exhibits a more pronounced impact on the vessel’s sinking volume compared to the width of the tunnel.The research results can provide reference for the design of navigation tunnel sections and key navigation parameters for the 1，000- ton ships.