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Numerical simulation and experiment were combined to study a self-making small-scale fluidized bed reactor. Different fluidized velocities were selected to examine its uniformity; different packing heights were set to examine the influence of critical fluidized velocity on particles; different particles were filled to test its fluidized property, and then to select the best inert support; different parts of furnace were installed with heating device to simulate its temperature field, all these numerical calculus and the experimental results were matched. The results indicated that the FLUENT software can be in good simulation to the mobility of particles in the small-scale fluidized bed reactor. The reactor can be used for the further thermal state experiment device.