The three-dimensional geometric models of static region (rudder, pipe and hull) and whirling region (propeller) are built with the Computational Fluid Dynamics (CFD) software, and the Reynolds-Averaged Navier-Stokes equations (RANS) are solved in the propeller flow field, thus the characteristics of thrust and torque generated by the marine propeller are numerically simulated. The pressure distribution, forces along different axes and torques around different axes of propeller blade under the ballast condition and full load condition are compared and analyzed, which provides more accurate and reliable stress for the shafting elasticity alignment, and provides beneficial reference for the production and design of marine propeller.