Setting method for communication address of indoor unit in air conditioning system and air conditioning system

The invention provides a setting method for a communication address of an indoor unit in an air conditioning system. The air conditioning system comprises at least one indoor unit. The setting method comprises the following steps: after the air conditioning system is electrified, an outdoor unit confirms all first indoor units which are not subjected to address distribution; the outdoor unit controls all the first indoor units to generate virtual addresses; the outdoor unit receives responding information of the corresponding first indoor units according to each virtual address and verifies the responding information; the outdoor unit assigns corresponding physical addresses to the first indoor units which pass the verification and send the physical addresses to the corresponding first indoor units; the first indoor units take the physical addresses as actual addresses and store the actual addresses. According to the embodiment of the invention, the address assignment of the indoor units can be automatically