Abstract: With single capacity increasing，wind power generation system has increasingly become a complex multi-domain system，which contains mechanical，electric，wind power and control systems and their coupling，requirements are higher for modeling and simulation. The method of modeling and simulation of the wind power system are presented，the advantages and disadvantages of the applications are analysed. Multi-domain unified modeling are introduced，it can provide effective tools for performance simulation of wind power generation system. The software based on Modelica can provide an unified tool for performance simulation of wind power generation system，simulations in different domains can be based on an unified model，it can realize seamless integration of different domain models.

Key words: wind power generation system, simulation, multi-domain, Modelica software