When the ice-going ships advance in the polar region,the navigation in the floe ice region is often encountered,the hull will suffer the high-frequency contact force produced by the floe ice,which will affect the navigation performance of the ship.Therefore,it is necessary to predict the water and ice force acting on the hull accurately.In this paper,the numerical simulation and experimental verification will be conducted for the polar scientific research ship-“Xue Long”.Based on the computational fluid dynamics(CFD)and DEM theory,a virtual mass method is proposed to realize the predicting of the water and ice force and the simulation of the interaction phenomenon between the ice and hull,the numerical method is built to calculate the force acting on the hull.At the same time,the synthetic ice is used to carry out the experimental research on the advancing straight with different speeds and the oblique navigation with different drift angles.The optimal virtual mass coefficient is determined through the comparison and analysis of the numerical simulation and test results under typical condition.According to the optimal virtual mass coefficient,the numerical simulation is carried out with different speeds and drift angles,which is compared with the experiment more deeply.It is found that the virtual mass method based on the combination of CFD and DEM can simulate the overturning and the sliding along the hull of the floe ice vividly,the relative error of the total resistance between model test and numerical method in advancing straight is almost within 10％,while the relative error of the total longitudinal force in oblique navigation is almost within 15％.