Operation mode setting method, remote controller and air conditioning system

The invention provides an operation mode setting method, a remote controller and an air conditioning system. The operation mode setting method comprises the steps that outdoor relative temperature information and indoor environment temperature are acquired when generation of a power-on command is detected; function mode parameters are determined according to the outdoor relative temperature information and the indoor environment temperature in combination with a preset temperature and a preset hysteresis temperature; fan control parameters are determined according to the indoor environment temperature and the preset temperature; and air conditioner operation setting data are generated based on the function mode setting parameters and the fan control parameters, and sent to corresponding air conditioners. Therefore, when the remote controller is started up, function modes and fan control strategies capable of being more suitable for the current actual demands are prejudged accurately and intelligently, before