Polystyrene-substituted [70]fullerene was synthesized via the reaction of C-70 with living polystyrene anions in the THF-C6H6 mixed solvents. The covalent graftings of the polystyrene arms onto the C-70 core result in the enhancement of the absorption degree at longer wavelengths, and in the decrease of the thermal stability and the glass transition temperature of the parent polymer. The other characterization results are also described.