We propose a method to choose the access point of the offshore wind farm（OWF）. The offshore wind farm is integrated into the onshore power system by the voltage-source-converter-based high-voltage direct-current（VSC-HVDC） transmission. The optimal access point is chosen from the optional access points. The optional access schemes can meet the requirements of the effective transmission of the wind power. We focus on the voltage characteristics of the onshore power grid under different access schemes. The development of the proposed method includes three steps. First

three major factors are introduced

i.e.

voltage support from onshore VSCs

voltage fluctuation caused by the change of wind power

and construction costs of the VSC-HVDC transmission system. Secondly

three evaluation indexes corresponding to the three factors are put forward. Thirdly

in the face of this multi-objective programming problem

a linear weighted model is proposed. The comprehensive weight can be got based on the theory of information entropy and the analytic hierarchy process（AHP） method. The method is applied in Zhejiang power system by use of PSS/E. The results show that under the optimal scheme

the voltage of the access area can keep stable during the critical faults. This demonstrates that the proposed methodology is an effective way to select the access point of the OWF.