A direction control system based on microcontroller is designed to regulate the blades orientation of small wind turbine.The system consists of wind direction sensor module,LCD module,driving module and the blades orientation control device.The wind direction sensor module measures the wind direction,which will then be sent to the control core of MSP430F149 microcontroller,and displayed by LCD.The system sends the adjustment signal to stepping machine,which will drive the wind turbine blades to face the wind orientation.The system can improve the work efficiency of wind turbines,thus has some practical significance for wind power plants.