In this paper, the temperature control of laptops is studied for the purpose of making laptops fit to work in low temperature environment. In the research, we designed the temperature testing module with the method of accuracy and simplicity, so that RF heating and PWM pulse is adopted. The AVR mega32 MCU is used as the core of the whole system, and Fuzzy-PID is chosen as the algorithm of the system. The system code is programmed by the C languages. The whole system is capable of keep the errors of temperature under 1°C.