Abstract: The effect s of compound ult rafine fibrous membranes as interlaminar interfaces on the mechanicalperformances of laminated composites were investigated. The compound ult rafine fibers were prepared by cO₂axialelect rospinning of Epoxy 609 ( E-03 609) and SiC solutions. The morphology and microst ructure of the compoundult rafine fibers were analyzed with scanning elect ron microscope ( SEM) and t ransmission elect ron microscopy( TEM) , and the mechanical behavior of the membranes was studied through tensile testing. The non2woven nanofibrous membranes were incorporated into the interlaminar interfaces in between adjacent plies of the laminatesbefore curing. The mechanical properties of the cured laminate panels were measured through three-point bending ,short-beam shearing and lateral impact test s. The result s show that the mechanical performances of the compositelaminates do not change remarkably when the interfacial nanofibrous membranes have a proper thickness and asuitable content of SiC.