Abstract: The electrospinning was used to produce multi-walled nanotubes (MWNTs) and polyurethane (PU) compound nanofibers. The morphology and microstructure of the compound nanofibers were analyzed by scanning electron microscope (SEM) and transmission electron microscopy (TEM). The crystallization and glass transition temperature (T_g) of the membranes were examined by XRD and DSC analysis. The relationship between the tensile properties of the membranes and the mass fraction of the MWNTs was revealed by tensile testing. The results show that the MWNTs with a suitable content can be efficiently dispersed in PU solutions and compound ultrafine fibers can be obtained. With the increasing of the content of the MWNTs in PU solutions , the diameters of the compound nanofibers become smaller,while the T_g becomes higher . Furthermore , the tensile strength and elongation at break of the studied membranes increase with the increase of MWNTs content in the hybrid nanofibers.