Abstract: Spinning solution of poly(hexamethylene adipate)(13%) was prepared using 2∶1(w/w) mixture of 1,2-dichloroethane and trifluoroacetic acid as solvent at room temperature.Poly(hexamethylene adipate) was electrospun into nano_fiber whose diameter in the range of 80～(500 nm,) and the nano_fiber composite membrane with electret melt-blowing nonwovens was also presented.The morphology of the nano_fiber was investigated by SEM,and the filtration property of the nano_fiber composite membrane with electret melt-blowing nonwovens was examined.The results showed that the filtration efficiency of nano_fiber composite membrane with electret melt-blowing nonwovens to the particles diameter about(0.3 μm) at a flow rate of(2.83 L/min) reaches(99.9%.)