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An experimental installation of cold model simulation was set up to study the bed pressure drop in different re-gions of ifxed lfuidized bed reactor during top feeding and bottom feeding, respectively, at various gas velocities with the lfuidization image of solid particles monitored at the same time. By comparing the changes in bed density and operating gas velocity in different regions of ifxed lfuidized bed reactor, the inlfuence of top feeding and bottom feeding patts on lfuidi-zation behavior could be investigated. The results showed that the bed density in top feeding reactor responded more stably to the change in gas velocity along with the advantage of working in a wider range of operating gas velocities. Based on this study, it is concluded that existing bottom feeding reactor conifgurations cannot meet the lfuidization requirements;and op-timization of bottom feeding reactor will be needed.