Refrigerating system of air-conditioning and method for controlling flow of refrigerant

The present invention discloses an air conditioner refrigerating system. A compressor, a four-way reversing valve and an outdoor heat exchanger are disposed on the outdoor machine. An indoor heat exchanger is disposed on the indoor machine. Two ports of the four-way reversing valve are connected to the air intake end and the air discharge end of the compressor, and another two ports of the four-way reversing valve are respectively connected to the outdoor heat exchanger and indoor heat exchanger. a capillary is connected between the outdoor heat exchanger and the indoor heat exchanger, an electronic expand valve is disposed between the capillary and the indoor heat exchanger, a liquid pipe temperature sensing apparatus is disposed between the electronic expand valve and the indoor heat exchanger, a inspiration temperature sensing apparatus is disposed at the air intake port of the compressor. The present invention also discloses a control method for refrigerant flux.