Fresh air system and control method thereof

The invention provides a fresh air system, a control method thereof and a fresh air conditioning system. The control method comprises the following steps of detecting an indoor environment so as to obtain state parameters of the indoor environment; and controlling the fresh air supply volume Q and the fresh air supply air volume Q in the unit time of the fresh air system at least according to theobtained state parameters of the indoor environment and/or the relative humidity of fresh air which is sent into a room. The most appropriate indoor comfort is obtained with the minimum energy consumption, and the method has a good energy-saving effect. 本发明提供了种新风系统及其控制方法、新风空调系统，所述控制方法包括：对室内环境进行检测，得到室内环境的状态参数；至少根据得到的所述室内环境的状态参数控制所述新风系统单位时间内的新风送风量Q和/或送入室内的新风的相对湿度，以最小的能耗获得最适宜的室内舒适度，具有非常好的节能效果。