The composite filler in PVC film is developed on the basis of soft filler and semi-soft filler, which has the advantages of both. Its structure is to change the plastic disc press buckle into a double-circle large plastic ring, press the aldehyde fiber or polyester filament on the ring of the ring, so that the fiber bundle is evenly distributed; the inner ring is made of snowflake-shaped plastic branches, which can not only hang the film , It can effectively cut air bubbles and improve the transfer rate and utilization of oxygen. The water and gas biofilm can be fully exchanged, and the organic matter in the water can be treated efficiently.