By adopting a laser interference method based on the traditional Michelson interferometer optical path with adding a temperature-controlled wedge sample cell,the refractive index of poly[(2-methoxyl-5-octyloxy)phenylene vinylene](MOPPV)tetrahydrofuran solution under conditions of different concentrations and temperatures were accurately measured.The experimental research show that the refractive index of MOPPV tetrahydrofuran solution linearly decreases with the temperature increase,and the refractive index...