When it comes to control "Micro Cooling Fan", using a thermistor thermocouple alternative approach has become more popular. Using a thermistor for temperature control is not new, this device was used to measure the temperature of the heat sink PCB-off and landing. Discuss their work and performance in the fan control to reduce noise, and improve efficiency. In the fan control thermistor-based, if the ambient temperature rises above room temperature, the detected temperature of the bridge will be a rise in temperature, and open "Micro Cooling Fan". This work is fully automated, when the ambient temperature is returned to room temperature, the fan will turn off. Negative temperature coefficient (NTC) thermistor can be very effective to detect the ambient temperature rises. Because it is a negative temperature coefficient, when the ambient temperature rises, "Micro Cooling Fan" thermistor resistance will be reduced.