Abstract: According to ‘zero-bed’ operation mode of riser-bed reactor used in commercial unit, a large-scale cold mode experiment device of riser-bed was established, by which the distributions of local solid content in the exit zone were studied in the ‘zero-bed’ operating mode. The results were compared with the one of riser-bed coupled operation mode. The experimental results show that, affected by the distributor, local solid content decreases first and then increases as the gas-solid flow approaches to the exit of the riser. The distributions of local solid content near the wall region have no similarity, while are similar in other region. The radial dissimilarity of solid content increases first and decreases later. Compared with the riser-bed coupled operation, in the ‘zero-bed’ operation mode, local solid content in the axial cross section close to exit is small in core region, but large in wall region. After the distance from exit increases to a certain value, the whole radial solid content is small in the ‘zero-bed’ operating mode.