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Circulating fluidized bed (CFB) riser reactors were widely used in chemical industry due to the good heat and mass transfer between gas and solid phase in such kind of reactors.Understanding this kind of reactor intrinsic hydrodynamics can help us to control and scale-up the process more accurately and purposely.Interest in the fluidized beds has continued unabated in recent years, a lot of experiment and modeling work have been done by many researchers[1-4].However, understanding about hydrodynamic behaviors of gas and solids phase in CFB risers remains insufficient due to the complex nature of the gas-solid two-phase flow.