Abstract: The govern equations of 2-D unsteady mobile-bed turbulent model in the orthogonal curvillinear coordinates,i.e.,the water movement equation and the non-equilibrium suspended load transportequation in tidal stream,were given in this paper.Techniques are suggested for some questions in calculations,such as,the basic data,typical tide level process,routhness,the suspended load size and the setting velo city,sediment recovery coefficient in non-equilibrium suspended load equation,and the criterion of erosion and deposition.The tide level and velocity process,the recir culate zone near the groin and the bed deformation during the regulating engineering were calclated by the example of Yongjiang at the tidal funnel about 5 kilometer from Zhenghai bend to Dayushan.The results are agreeable the observed data.The changes of stream structure and erosion and deposition on the channel at the Zhenghai port due to the Lenbo Bridge were calculated by the equations.