Developed on the basis of conventional short bag pulse filter bags, is a new type, high efficiency bag precipitator. It is not only combines the advantages of sub-room cleaning and pulse cleaning, and lengthen the filter bag, give full play to the role of air force jet cleaning. To overcome the disadvantage of sub-room cleaning dust low intensity and pulse cleaning dust filter running at same time, to prevent dust attached to the surface of the filter-bag, thereby improving the rate of filter speed, saving energy consumption and lengthen the life of filter-bag.