Abstract: Pressure distribution of the riser and the standpipe of a cold model CFB (Circulating Fluidized Bed) reactor combined with a coal pyrolysis reactor was studied by using sixteen channels pressure sensors. The riser column is 0.1 m in diameter and 6 m in height. And the standpipe is 0.044 m in diameter and 3 m in height. The rectangle pyrolysis chamber that has a cone-shaped gas distributor with a cross section of 200 mm×200 mm and 0.77 m in height lays between the cyclone dipleg and the standpipe. The effects of the superficial gas velocity in the riser, the circulating rate, the aeration to the pyrolysis chamber and the initial inventory on the pressure distribution of the system were investigated. The results showed that the pressure gradient in the riser and standpipe was gradually decreased with the superficial gas velocity, while it was increased with the circulating rate at the constant superficial gas velocity. The effect of the aeration to the pyrolysis chamber on the pressure distribution of the standpipe was more remarkable than on the riser. Moreover, increasing the initial inventory would lead to the increase of pressure distribution of the riser and the standpipe.