We synthesized poly(para- and meta-phenylenevinylene) derivative with liquid crystalline group. The polymer is composed of p-phenylenevinylene as a spin generating unit and m-phenylene as a ferromagnetic spin coupling unit. The polymer showed nematic LC phase. The polymer was doped by iodine to generate the polaron, after the polymer was cooled down through the LC phase. ESR measurements showed that the spin concentration increased by means of external magnetic force alignment of the polymer.