There is described the state od hydrocarbon resins (coumarone-indene) production in Poland. Results of own investigations of hydrocarbon resins obtaining from coumarone-indene fraction modified with alpha-methylstyrene of reagent purity and with alpha-methylstyrene fraction by cationic polymerization in the presence of liquid AlCl3 complex-catalyst which was prepared at ICSO are presented. There is demostrated the possibility of production of various sons of hydrocarbon resins as a results of assorting contents of unsaturated compounds in being polymerized fraction and utilization of the new material sources.