The background technology of a method capable of inhibiting natural decay and preventing various diseases for displaying items is a dustproof isolation sealing display transparent cover. The method is characterized by reducing pollution on display articles and especially frangible historical relics by various particles in the air outside a display transparent cover and by sweeping of harmful gas, steam and harmful bacteria continuously and by preventing contact from people or objects. But the survival and reproduction of bacteria already present in the cover cannot be completely eradicated so that damages on display articles and especially fragile historical relics cannot be eradicated and the air inside the cover cannot be timely controlled. The technical solution features are that the method not only possesses all the features of the background technology, but also can guarantee the absolute consistence between the inner air pressure and the outer natural air pressure; inactive gases are utilized to eradicate damages on display articles especially historical relics from all harmful factors in the air, except controllable light energy; and there is an intelligent control/switch device for the air inside the cover.