Ultra-fine polyhydroxybutyrate-valerate(PHBV) fibers were prepared via electrospinning technique. The structure and morphology of the electrospun fibers were determined by scanning electron microscope(SEM)

thermal analysis(DSC)

wide angle X-ray diffraction (WAXD) and FT-IR．The effects of concentration

electrical potential and the distance between the spinning tip and the collector upon the morphology of electrospun fibers were also discussed．The results show that electrospinning occurs only when electrical potential exceed a critical value which is related with solution properties．When solution concentration in creases

the average diameter of electrospun fibers increases．And the increase of electrical potential may result in decline in average diameter. With the increase in distance between the tip and the collector

the diameter also experiences a slight growth．It is also found that electrospinning process promotes the crystallation of PHBV

which may be caused by the orientation of molecule chains due to electrical force stretching.