A predictive two-region model previously developed by D.-R, Bai, J.-X. Zhu, Y. Jin and Z.-Q. Yu, Powder Technol., 85 (1995) 171, is used to illustrate the characteristics of the core-annulus internal recirculation flow structure in circulating fluidized beds. The variations of the flow parameters with operating conditions are examined using the simulation results. While most predictions agree well with the available experimental data, other simulation results are yet to be confirmed when more relevant experimental results become available.