Abstract: The high filtration efficiency and low flow resistance of air filtration materials were successfully prepared by composing electrospinning poly(vinylidene fluoride) (PVDF)-polyacrylonitrile (PAN) nanofibers with Polyethelyene(PP) melt-blown nonwoven. The influence of the PVDF-to-PAN mass ratio on solution properties, morphology, specific surface area and filtration properties were investigated. The results show that when the PVDF-to-PAN mass ratio is 3:5, the solution has excellent spinnability and the well-distributed nanofibers with mean diameter of 0.59μm can be formed. BET test result shows that it went for nearly double the specific surface area when PVDF-to-PAN mass ratio decreases from 2:1 to 3:5. Besides, the filtration efficient and resistance determined by TSI 8130 filter were tested. Results reveal that electrospinning PVDF-PAN nanofibers can significantly improve the filtration performance of polypropylene meltblown nonwovens, the filtration efficiency of PVDF-PAN/melt-blown PP nonwoven reaches to 99.95%, significantly higher than that of melt-blown nonwoven with 65%, filtration resistance is 77 mmH2O (1mmH2O=9.8Pa), filter quality factor reaches 0.0987, which is more higher than 0.0168 of melt-blow nonwoven. The filtration properties significantly enhances by composing electrosping PVDF-PAN nanofiber with melt-blow nonwoven.