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．