The morphology and the fineness of the nanofibers mat were observed through scanning electron microscopy ( SEM), and the jet was intercepted by glass slide to evaluate the changing rate of the diameter of fiber on spinning. 运用扫描电子显微镜(SEM)观察了纺出的纳米纤维膜的形貌和细度,利用载玻片截取射流,研究了纤维的直径变化率。