The fixed micro-hole aeration suspension pipe device, which is a more ideal oxygen solution efficiency, convenient maintainance and reliable operation aeration, is developed under the theory of oxygen transfer in the water and the various kinds of  mobile floating aeration devices. The air pipe of the device, assembled above the water, is not in contact with the sewage and is not perishable. One end of the aeration joint, which is equipped with a quick joint and a gas saving valve, is connected to the quick connector and the other end is connected to the air branch. When installing and over hauling, do open the quick connector and the connecting pipe, the exposure pipe can be removed from the the tank, the aeration device, then, can be lifted from the water for overhaul and replacement. In case of replacing a single aeration film, adjusting the throttle valve after replacing the film so that the air volume remain as same as that of the former aeration pipe that has not been replaced, solved the problem of uneven aeration due to te replacement of a single aeration film on the bronchial of the same valve. There is no need to drain the sewage in the pool and no need for water maintainance and construction. The exposed trachea is suspended on the connecting tube and stays at a depth from 4 to 5M. When the bubble escapes onto the surface, the diameter will be about 5μm. The tiny bubbles enlarge the square of oxygen contact and increase the efficiency of oxygen transmission. Compared with other suspension aeration devices, this device has the following advantages: good aeration effect; easy maintenance; non-stop of production when maintenance or construction;no underwater work;safety of maintenance and construction guaranteed; General application for various kinds of sewage treatment aerobic system.