Besides the massive dusts and the bacterium which is lead from outside,the inclosed room, where people move inside,still has much pollution particles,for instance: dust,oil smoke,human body bits,unusual smell,harmful chemical fiber,mold,and so on; varnish, cleaning chemical and pesticide can produce some harmful matter such as,carbonmonoxide,methylene chloride and so on.The inclosed desigh of the air-conditioner in modern work condition,put people in the harmful gas which was sent out by decoration building materials (formaldehyde) and copying equipment (ozone) for a long time.In addition,the air-conditioner and rug lack of maintenance,make the room pollution more serious.