A coupled modeling system is developed to study the interactions between wave, current and tide in Bohai Sea during a winter storm. The coupled modeling system includes a wave model-WAVEWATCH III and a three-dimensional Ocean model-POM. Numerical results show that the interactions have a strong impact on all the elevation, current and wave fields. The sea surface elevation can increase 7cm in the Laizhou Bay, and decrease 7cm in the Liaodong Bay under the effect of the enhanced wind stress derived from the surface wave. The wavee influence on the wind stress also can increase the magnitude of surface current 8cm/s in the central Bohai Sea. The significant wave height waries as much as 40% under the effect of tides and surges in some coastal areas.