An advanced supervisory control and data acquisition(SCADA) system is designed for non-grid-connected wind power plants. The traditional supervisory control system for wind plants, grid monitor and power distribution station are integrated into the SCADA system. The SCADA system, with the integration of the characteristics and requirements of non-grid-connected wind plants, can be used to implement the supervisory control and data transmission among the wind plant, grid and factory. Thus the wind power system can be controlled from the generators to the loads. The structure and the functions of the SCADA system are studied.