On the basis of observation for wind fields and wind wave fields in Lake Dianshan, the wind wave fields were numerical-ly simulated with the SWAN model.Comparisons of wave height between modeling and measurement indicated that the variation tendencies of the modeled wind wave fields were in agreement with those of the measured data.However, the fluctuation amplitudes of measured data are greater than those of modeled results.On the whole, the modeled wind wave fields are reasonable and relia-ble.Therefore, the wind wave fields in Lake Dianshan have been systematically simulated with different water levels and different wind fields.The modeled results can be taken as the reference basis for the flood prevention and environmental conservation of Lake Dianshan.