In accordance with the Korean government's policy on the energy industry that named as 'New & Renewable Energy Strategy 3020', much investment is being made in solar power generation and offshore wind power generation to raise the proportion of renewable energy up to 20% until the year of 2030. Surrounded by the sea, Korea has abundant potential energy to utilize offshore wind power and is ahead of other marine-based energy sources(such as tidal power generation, wave power generation, etc) in terms of technology development and demonstration complex operation. According to the 2018 Global Wind Report, the global wind power generation capacity is rapidly developing from 23,900MW in 2001 to 486,790MW in 2016, and electricity production by wind power generation would be expanded due to reaching the Grid Parity that the cost of generating electricity by the wind is less than or equals the cost of the fossil fuel. In this study, a standard of staffing level on surveillance facility of domestic offshore wind farm was proposed based on results of field survey on Vessel Traffic Services(VTS) and monitoring center of offshore wind power plant. The required number of operators per workstation was presented according to the IALA calculation formula. In addition, a minimum number of surveillance personnel should be kept by the operators who have experiences as a ship’s deck officer considering the special circumstances of the sea. In particular, a surveillance team shall be comprised by one or more persons who have a license of deck officer over grade 5. Meanwhile, a surveillance personnel who is not experienced on board should complete the necessary education and training programs for the surveillance in advance at the relevant and approved educational institution. It is expected that the results of this study could be utilized in operational regulations of the domestic offshore wind farm.