Method  Definition of Intelligent offshore wind farm was firstly proposed and then architecture of the intelligent offshore wind farm was established. The intelligence of offshore wind farm was formed vertically of four strata， such as intelligent device， service control， plant-grade control and group supervision. Construction means and detailed project practice advices were put forward， guiding the intelligence of offshore wind farm.

  Result  The proposed intelligence method covered the entire life cycle of project， including the design， infrastructure and operation and realized intelligent monitoring and management of offshore wind farm equipments and assets.

  Conclusion  The proposed method can improve the automation level， operation and maintenance efficiency of offshore wind farms， reduce operation and maintenance costs， and improve the ability of resisting risks.