Abstract： The research of self-propulsion performance plays a vital role in the ship-design and the development of the novel ship. To achieve the prompt prediction of propulsive performance, this paper simulated hull/propeller interaction using a convenient prescribed bodyforce method and computational fluid dynamics (CFD).The free surface viscous flow around MOERI container ship (KCS) was simulated at the selfpropulsion point. An iterative bodyforce method which couples the Vortex Lattice Method (VLM) of the propeller lifting surface with the RANS solver was presented.  Both the force and moment computed by VLM were input to RANS as the source term while the inflow to the propeller computation from the viscous velocity subtracted the induced velocity at the propeller plane.  The iterations between the VLM and RANS were prosecuted until the propeller thrust and torque coefficients were converged within a specific tolerance. All the progress was done automatically by an integrated program which coupled RANS/VLM solvers. The computed results agree well with the measured data. The method adopted in this paper predicts the performance of selfpropulsion accurately and efficiently.