The effects of reaction temperature, reaction time and mass ratio of catalyst to oil on product distribution, yields of light olefins (including ethylene, propylene and butylene), and group composition of gasoline upgraded were investigated by using micro-reactor and gas chromatograph integrated method in catalytic reformulating. The experimental results show that olefin content in gasoline decreases from 42.6% in raw material to nearly 13.4%, which is met with the requirements of new gasoline standard. The contents of iso-alkane and aromatics are markedly increased from 28.4% and 18.2% to 40.4% and 35.7%, respectively, while the octane number of gasoline is not reduced. Meanwhile, higher yields of light olefins (25%) are also obtained after FCC gasoline being reformulated under laboratory conditions. In addition, higher reaction temperature, longer reaction time, and higher mass ratio of catalyst to oil are beneficial to decrease olefin content of FCC gasoline and increase the yields of light olefins.