To make "Micro Cooling Fan" This becomes more intelligent household appliances, mainly on having the temperature control fan speed automatically size, automatic switch-enabled smart fan design and production. STC89C51 microcontroller design the fan's automatic control system, using DS18B20 digital thermometer for temperature testing, infrared receiving control signals to achieve the fan control. The system has changed the traditional manual control "Micro Cooling Fan" of speed and switch, automatic level control based on temperature, easy to use in the summer when people go to bed at night. The fan is stable, it can be applied to real life. Intelligent fan control system, refers to the fan motor speed is controlled as the amount collected by the STC89C51 SCM analysis of digital temperature signal, and then through the SCR to "Micro Cooling Fan" motor speed. So as to achieve without human control will automatically adjust the size of the effect of the wind.