A temperature control method is used to determine a lot of temperature measurement data, at the same time, delete the abnormal data, screen the highest temperature and the lowest temperature, determine the temperature data, report the state information, output a heating control instruction and realize the enclosed loop management from the temperature measurement to the heating control, and adopts a temperature control system to realize. The temperature control system comprises a temperature controller, a temperature sensor network, a heater network and a power supply, wherein the temperature controller comprises a measured temperature input module, a CPU, a heater control module and a power supply conversion module, converts, acquires and determines the temperature data, acquires all working state information of the heater network, generates a heater control instruction, controls the on-off of a heater power supply access, and realizes the temperature enclosed loop control.