By accounting for the effects of ocean surface velocity (wave velocity and current velocity) into the estimating of wind stress drag coefficient Cd,the spatial distribution of Cd and wind stress τ are examined over the tropical and northern Pacific in 2004,on the basis of empirical formula that employs wave steepness δ as another parameter besides wind speed in characterizing Cd.With the help of current data generated from Hybrid Coordinate Ocean Model (HYCOM) and the waves data from Wavewatch Ⅲ (WW3) model,details of the geographic variability of drag coefficient and wind stress arc statistically categorized and discussed.It is pointed out that,the ocean surface drift velocity influence the drag coefficient significantly,about 5% in avenge.The results also present that accounting for the ocean surface velocity dependence in the wind stress τ can lead to significant changes in it,hereinafter the modeling of many oceanic and atmospheric processes,which taking wind stress as one important parameter.