Abstract: Three- and two-dimensional models are used in combination to simulate and analyze the influence of tidal turbines on the hydrodynamic conditions in the near-field and far-field, and applied in a case study of the Putuo-Hulu islands tidal energy test field. We present a method for generalization of tidal turbines that, based on the energy equation, calculates resistance loss in the flow passage to determine the equivalent roughness of the turbines, construct a three-dimensional model of the turbines’ near-field flow in the frame of Computational Fluid Dynamics (CFD), and simulate and analyze the velocity distributions in seven conditions of different combinations of turbine rotating speed and inflow velocity. A two-dimensional tidal model is developed on the finite element method (FEM) solving the shallow water equations, and the influence of turbine operation is simulated using larger roughness at the grid nodes occupied by the turbines. Results show that the size of affected zone depends on the tidal flow velocity and the terrain near the berth, and that the further away from the turbines, the less incidence from the turbines into the flow field. In the far-field, the influence is not significant and the flow velocity varies in the range of 2% - 8% relative to the velocity before the turbines.