Abstract: Qingyang Petrochemical Branch Company adopted auxiliary lifting pipe reducing olefin in gasoline technology to make technical innovation on catalytic cracking unit and increased unit production capability from 30×104 t/a to 65×104 t/a, gasoline research octane number is 90. 2, average catalyzer consumption is 1. 4 kg/t, and gasoline olefin hydrocarbon content decreased under 35v%. Comparing the unit before innovation, light oil average collection is 70. 6%, which increased 15%, diesel and gas increased from 0. 8 to 0. 96, comprehensive energy consumption decreased form 130. 7 kg to 79. 6 kg per ton.