LFEF glass fibre bag filter is a new researched product for cement mechanical vertical kiln and waste gas removal of dryer by Jiangsu China-mining Environment Engineering Co. Ltd. Measures are adopted in this filter in order that it can work effectively and stablely in the dust removing of mechanical shaft kiln and dryer, such as controlled by computer,back-flushing with different chambers, ash removal in fixed time and with fixed resistance and tempreture inspecton. Outlet air content from the chimney is lower 100mg/m3 which is regulated in the national standard. The bag filter can change the bags without stopping the machine. It can operate simply, safetly, dependablely with low cost. It is an efficient piece of equipment to remove dust in mechanical shaft kiln and dryer.