When initially "220V Cooling Fan" is set to strong wind, fan operation by strong natural wind for half an hour, and changed the natural wind, half an hour after becomes weak natural wind, until the preset end time, or turn off the far ; When initially setting a stroke, according to the natural wind fan running for half an hour, then switch into low nature wind, until the preset time end or turn off so far; when the first "220V Cooling Fan" is set to weak wind, fan by weak natural wind operation until the end of the preset time, or turn off so far. From the perspective of software layers, it is based on the previous time lost "220V Cooling Fan" status and the user's incoming determine the type and speed of wind current time to be output. From a software driver layer perspective, the current time is to determine the correct type and speed of wind quantized into wind speed to be output according to the software layer.