The aligned films, the homogeneous film, the 90 degrees-twisted film and the 180 degrees-twisted film, have been prepared by immobilizing the polymerizable liquid crystals under the UV irradiation. The relation between the thermal conductivity and the aligned molecular direction of the films was investigated. It is indicated that the additional thermal transmission effect, which the increase of the thermal conductivity may be induced, would exist in the twisted films. (c) 2006 Wiley Periodicals, Inc.