The ship traveling wave in the restricted channel of inland river has the characteristics of high wave height and rapid flow velocity. The ship traveling in the restricted channel will change its trim with the pressure fluctuation, and will cause grounding accident when it sinks seriously. This paper takes a navigation project as the research object, with the help of computational fluid dynamics software, using GMRES pressure solver and RNG k-ε turbulence model to study the ship's navigation subsidence under 32 conditions of different speed, different water depth and different tunnel width in the restricted channel. The research shows that the maximum subsidence and the maximum longitudinal inclination of the ship increase with the increase of the speed and the tunnel width, and decrease with the increase of the water depth. The results can provide scientific guidance for the safe navigation of ships in restricted inland waterways.