Abstract: The interest in biomass technology has got a lot of attention due to the increase in fuel prices and issues like global warming. Producer gas as a alternative fuel, produced from biomass gasification process can be used to generate power and electricity. However, in air blown gasification, the producer gas produced has Low Calorific Value (LCV) about 4-6 MJ Nm-3 with CO2 content around 10-20% by volume. To increase the LCV, the used of calcium oxide, CaO as sorbent to absorb CO2 in the producer gas can make biomass technology more viable. In the present study, the aim is to study the fluidization of the bed in terms of the bed expansion and the pressure drop of the 1000 μm CaO-sand mixtures at different percentages, the air volume flow rate and pressurize air intake in the cold model experiment. The behaviors of 1000 μm CaO-sand mixtures have been conducted in a Small Bubbling Fluidized Bed (SBFB). The results show that the decrease of the CaO percentages from 70, 60, 50 to 40, will increase the pressure drop (ΔP) in the SBFB under constant pressure of 2, 3, 4, 5 and 6 bars. The bed expansion height also increased under all air pressures except at the low superficial flow velocity less than 0.06 m sec-1 at 2, 3, 4, 5 bars (70, 60% CaO mixture), when the air volume flow rate increased (in term of superficial flow velocities 0.020 to 0.215 m sec-1). The conclusion has been determined where the CaO percentages of 50 and 40 were found to have a good fluidization in the range of 15-55 L min-1 for all pressurize air compressors supply (2, 3, 4, 5 and 6 bars) when tested in a SBFB.