T series temperature control is an electric switch controlling temperature range. It receives the change of temperature and controls the temperature of refrigeratory together with electromagnetic valve. The thermo bulb of the temperature controller is laid in the refrigeratory. When the refrigerator's temperature falls down to the lower limit of setting valve of the temperature controller, the temperature controller will act to close the electromagnetic valve and stop refrigeration agent from entering the refrigeratory's evaporator, so the refrigerator's temperature won't fall down further. Contrarily, when the refrigeratory's temperature rises to the upper limit of the setting value of the temperature controller, the temperature controller will act to open the electromagnetic valve and the refrigeration agent will enter the evaporator of the refrigeratory for refrigeration action, and hereby the refrigeratory temperature will fall down gradually. Owing to the action of temperature controller, refrigerator can be kept in a stationery temperature range.