The invention provides an air conditioning system. The air conditioning system comprises an outdoor unit and two indoor units. The two indoor units are different in evaporating temperature and work in different areas of the same indoor space. The outdoor unit comprises a double-cylinder compressor, and a first interface of a first four-way reversing valve and a first interface of a second four-way reversing valve are connected with an exhaust opening of the double-cylinder compressor. An end opening of a first liquid storer and an end opening of a second liquid storer communicate with two compression cavities of the compressor correspondingly, and the other end opening of the first liquid storer and the other end opening of the second liquid storer communicate with a second interface of the first four-way reversing valve and a second interface of the second four-way reversing valve correspondingly. A first end opening of an outdoor heat exchanger is connected with a third interface of the first four-way reversing valve and a third interface of the second four-way reversing valve. The two indoor units are each provided with an indoor heat exchanger. One end opening of each indoor heat exchanger communicates with a second end opening of the outdoor heat exchanger, and the other end opening of each indoor heat exchanger communicates with a fourth interface of the first four-way reversing valve or a fourth interface of the second four-way reversing valve. By means of the air conditioning system, the effect that the two different evaporating temperatures in the two different areas are controlled at the same time is achieved.