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The water entry process associated with complicated unsteady structures,with consideration of the influence of the waves,is not well studied.In the present work,the oblique water entry of a cylinder under different regular waves is numerically investigated.The volume of fluid (VOF) method and the sub-grid scale (SGS) stress model based on the large eddy simulation (LES) method are adopted for the 3-D simulation with six degrees of freedom.The present numerical model is based on a wave model,and as shown by the previous work that the predicted cavity evolution in the calm water agrees well with the experimental results.The present model is validated and it is shown that it could be used to predict the correct wave periods and fluctuations.The cavity evolution mechanism,the dynamic characteristics and the vortex structures are analyzed.The cavity of the water entry with waves closes more quickly than in the calm water case.Finally,several parametric studies of the water entry with different wave heights and water entry locations are carried out.The results provide insights into the effects of the waves on the cavity dynamics for oblique water entry problems.