obtaining an exhaust gas pressure of a compressor, a return g gas as pressure of the compressor, a working frequency of the compressor, an exhaust gas temperature of the compressor, and a return gas temperature of the compressor;

determining a return gas saturation temperature corresponding to the return gas pressure;

calculating a temperature difference value based on the return gas temperature and the return gas saturation temperature;

in accordance with a determination that the temperature difference value is smaller than a predetermined threshold value, calculating a return dryness of the compressor based on the exhaust gas pressure, the return gas pressure, the working frequency, and the exhaust gas temperature; and

subsequent to calculating the temperature difference value based on the return gas temperature and the return gas saturation temperature:

in accordance with a determination that the temperature difference value is greater than or equal to the predetermined threshold value, determining a predetermined return gas dryness as the return gas dryness of the compressor;

generating an adjustment strategy based on the return gas dryness of the compressor; and

adjusting an operation state of the compressor based on the adjustment strategy to modify the return gas dryness of the compressor to within a predetermined return gas dryness range.