If the thermostat is mechanical, the digital file size of the thermostat should be adjusted according to the seasonal environmental temperature, with a smaller digital file in summer, a medium digital file in spring and autumn, and a larger digital file in winter. The temperature of the freezer should be kept at about-18, and the temperature of the freezer should be kept at1-0/0 degrees, preferably 4-. It is suggested to put a thermometer in the refrigerator for actual measurement. If the temperature is too high, turn up the digital file. If the temperature is low, turn down the digital gear.