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The effects of operating conditions on the distribution of olefins in the FCC gasoline, obtained during catalytic cracking reaction in the presence of the GOR-Q catalyst and conventional Iv4LC-500 catalyst, have been studied in detail.The test results showed that the GOR-Q catalyst could obviously reduce the content of several kinds of olefins in FCC gasoline.Olefins in the FCC gasoline consist mainly of C5-C7compounds, that are composed of C=C bond with normal or monobranched chains. The reduction of gasoline olefin content could be achieved by decreasing the content of above-mentioned olefins. Lower reaction temperature, lower weight hourly space velocity (WHSV) and higher catalyst to oil ratio would help to reduce the content of olefins with a C = C double bond, normal olefins, mono-branched-chain olefins and diolefins. To decrease the loss of gasoline octane number, the operation for olefin reduction should be firstly focused on increasing the catalyst to oil ratio.