This research analyzes the performance of the High Severity Fluidized Catalytic Cracking (HS-FCC) bench-scale system which is modified by adding a riser. The riser is installed after the downer, so the cracking process occurs in the downer and riser. The purpose of the downer and riser integration is to extend the cracking time in a limited space.This system consists of a catalyst preheater, a regenerator, feedstock evaporator, a downer, a riser, 2 separators, a condenser, 1 blower, and a control system that regulates the rate of oil and air. The innovation of this FCC bench-scale system is 1) used heat from the combustion reaction in regenerator as the only heat source 2) applied fouling film principal to evaporate the feedstock by using the threaded rod. The reaction time was carried out for 45 minutes with palm oil of 1.7 l/hour and cto 0.3. The average temperature in the riser is of 400 o C. The gasoline composition in the liquid product is 7.88 % wt, lower than other research. Interestingly, the gasoline composition has lower aromatic content (32.25 % wt) and a high RON number of 174 compared to other research.Keywords: FCC, cracking, downer, bio-hydrocarbon, RONThis research analyzes the performance of the High Severity Fluidized Catalytic Cracking (HS-FCC) bench-scale system which is modified by adding a riser. The riser is installed after the downer, so the cracking process occurs in the downer and riser. The purpose of the downer and riser integration is to extend the cracking time in a limited space.This system consists of a catalyst preheater, a regenerator, feedstock evaporator, a downer, a riser, 2 separators, a condenser, 1 blower, and a control system that regulates the rate of oil and air. The innovation of this FCC bench-scale system is 1) used heat from the combustion reaction in regenerator as the only heat source 2) applied fouling film principal to evaporate the feedstock by using the threaded rod. The reaction time was carried out for 45 minutes with palm oil of 1.7 l/hour and cto 0.3. The average temperature in the riser is of 400 o C. The gasoline composition in the liquid product is 7.88 % wt, lower than other research. Interestingly, the gasoline composition has lower aromatic content (32.25 % wt) and a high RON number of 174 compared to other research.