A process for producing a conductive liquid-crystal material comprising the steps of heat-treating a liquid-crystal composition composed of at least two components having a smectic phase as a liquid-crystal phase, at least two components are being selected from distyryl derivatives represented by the general formula (1), in a temperature range suitable for a smectic liquid crystal state and lowering the temperature wherein R1 and R2 are independently represent a linear or branched alkyl group, and R1 and R2 may be the same group or different group.