Blend membranes of poly(vinyl alcohol) and k-carrageenan were prepared by solution blending. Their pervaporation characteristics for 90wt% aqueous ethanol solution were investigated in terms of blend ration and operating temperature. The blend behavior of these membranes exhibits homogeneous morphology unrelated to blend ratio, and the results were analyzed by using SEM and X-ray diffractometer. The swelling phenomenon of the prepared membranes decreased with increasing of k-carrageenan content because of its rigid properties. For the pervaporation characteristics, the permeation fluxes of the overall blend membranes were smaller than pure membranes but the separation factor was higher. Especially, in the case of 50/50 blend ratio the permeation flux showed a value, and the maximum separation factor appeared at the 25/75 blend ratio. As a result of this, it can be considered that these membranes have a more compact network structure. In the pervaporation process, with an increase in operating temperature, the overall permeation fluxes increased significantly but the separation factors decreased, respectively. The results were explained in term of the plasticizing effect of water on the membrane. However, in the case of 25/75 blend ratio the pervaporation performance at 60℃ was better than that of pure membranes at 30℃. This result indicates that it is possible to prepared high performance blend membranes by controlling blend ratio and operating condition.