The blend membranes were prepared by introduction of TPU into a dispersive resin PTFE. The morphology and thermal properties of the blends, and the rebound elasticity of the membranes were studied. The transmission electron microscopy(TEM) shows that the TPU is fine dispersed in the blends. The scanning electron microscopy (SEM) micrographs exhibit multi-microporous structures of biaxial stretching P TFE/TPU membranes. The PTFE and the TPU of the membranes were stretched into small fibers. The rebound elasticity of biaxial stretching PTFE/TPU membranes was st udied. The results show that the rebound elasticity and tensile elongation of PT F E membranes are both improved with the increasing of TPU.