With the socio-economic development, the air-tightness and heat insulation in buildings have been influencing the work and life of people. The deterioration of Indoor Air Quality (IAO) has been the common concern in the circle of air-condition industry. 　　Air-condition system is widely used in modern buildings to people comfortable. But long exposure in such compact and air-conditioned environment may lead to tiredness, vapidity, allergy, this is called "air-Condition syndromes" 　　In addition, the application of new materials in furnishing buildings pollutes the indoor air, produces volatile chemicals such as formaldehyde, benzene which is hard to dilute or replace, posing great threat to the health of people, causing respiratory or neuropath diseases. 　　Fresh air ventilator can replace polluted air with fresh air, solving the problem of quality deterioration of the air. It exhales and inhales at the same time, creating a comfortable in-door environment. 　　If used together with central air-conditioning system, fresh air ventilator will perform its best effect. Because this helps lower its workload of fresh air0, decreases the capacity of the heat or cold air, lowers the energy consumption of the air-conditioning system, thus being energy saving. This has become the new concept in the design of air-condition system. 　　Fresh air ventilator can serve the needs in Luxury hotels, offices, conference rooms, exhibition centers, hospitals and workshops and soon.