Abstract: The polyester nanofiber membrane used in the field of dust removal was prepared by electrospinning. The fiber membrane microstructures were characterized by scanning electron microscopy. The optimum spinning conditions were determined. The nanofiber membrane under the optimum spinning conditions was attached to the filter surface， and the resistance characteristics test， the classification efficiency test and dynamic filtration performance test were applied to the nanofiber membrane filter. The results indicated that 15kV spinning voltage， 21cm receiving distance and 18% spinning solution concentration are the optimum spinning conditions. The nanofiber filter prepared under the optimum spinning conditions has low resistance and good cleaning performance. The filtration efficiency of fine particles below 3μm is over 99.99%， the filtration efficiency is improved obviously， which can effectively control the fine particles.

Key words: electrospinning, nanofibers, filter, spinning parameters, filter efficiency