FIELD: chemical industry. SUBSTANCE: described are method and stabilized catalyst system for preparing olefins, stabilization involves containing catalyst system for preparing olefins with unsaturated aromatic hydrocarbon containing from 6 to 20 carbon atoms at temperatures from -50 C to 70 C. Contact time is 1 h, and amount of hydrocarbon is 6000 moles per mole of active chromium compound. The resulting stabilized catalyst system has higher heat resistance. EFFECT: improved catalyst system and more efficient preparation method. 18 cl, 2 ex, 2 tbl
