In this paper, the morphological structure and properties such as, miscibility, tensile strength, flux and retention ratio of hollow-fiber membranes manufactured by PAN mixing with small amounts of PVDF have been studied. The hollow fiber was made from a spinning solution composed of polymer (PAN : PVDF=10 : 0, 9 : 1, 7 : 3), additive (PVP, PEG-600) and solvent (DMAC) when immersed in water. The spinnability of blend polymer and the influences of blending on spinning technology have been observed; the morphology of membranes were examined by SEM. The blend membranes possess much higher flux than PAN membrane and fairly good retention ratio especially for the membrane made by PAN:PVDF=9:1.