Pressurized circulating fluidized beds are applied in a range of applications because of intensified heat and mass transfer and chemical reaction. The gas density increases linearly with the pressure, which influences the gassolid flow characteristics. In this work, the effects of operating pressure (0.1 MPa-0.6 MPa) on the distribution of particle volume fraction and gas-solid slip velocity in the riser are studied under different conditions. The particle belongs to Geldart B group, the solids circulation rate ranges from 20 to 50 kg/(m(2).s), and the fluidizing gas velocity ranges from around 2 to 8 m/s. With an increase in pressure from 0.1 to 0.6 MPa, in order to achieve the same solids circulation rate, the fluidizing gas velocity decreases approximately to a half. Under pressurized conditions, the profile of particle volume fraction along the axial direction shows a similar trend, while the particle volume fraction in the bed central zone at the upper riser increases slightly. Under different pressures, the plot of the nondimensional gas-solid slip velocity against the particle volume fraction converges on a power correlation. The present study is a first step towards the aim of correlating the solids circulation rate and gas-solid slip velocity with operating parameters under pressurized conditions. (C) 2020 Elsevier B.V. All rights reserved.