Renewable energy has been drawing more attention since the advent of global warming effects. Multiple energy sources have currently become one of the goals for the energy policy of the developed countries around the world. Wind Generation (WG) is a natural renewable energy source. It is one of the most environmental friendly and no pollution energy source, and attracted most attention. In order to understand the wind power system, this report investigates the wind power system, including wind power theorem, system construction, wind turbine component, wind turbine auxiliary system, and SCADA system.