Abstract: An offshore wind profile model based on neutral equivalent wind speed was proposed as a result of the current situation that long term measured data is deficient, hub height of offshore wind turbines is higher than that of anemometer tower, and the precision of extrapolation is low. Firstly, the influence of wind shear exponent, atmospheric stability and turbulence intensity on offshore wind resource has been studied. Secondly, we compared the proposed model which had been validated with measured data of two offshore wind farms to the conventional extrapolation approach. The result indicates that the root mean square error of wind speed of the proposed model can be reduced by 0.03 m/s to 0.37 m/s in two wind farms, and the root mean square error of wind power density can be reduced by 9.04 W/m~2 to 83.58 W/m~2, respectively in two wind farms. In addition, the model has effectively reflected the effects of the roughness of the surface dynamics and atmospheric stability on the ocean wind profile, which makes up for the deficiency of conventional formula of wind shear exponent, and also provides a basis for offshore wind resource assessment and preliminary planning for offshore wind farm.