The influence of temperature on fluidization was investigated by a statistical chaotic attractor comparison test known as S-statistic.After calibration of the variables used in this method,the S-test was applied to the radioactive particle tracking(RPT) data obtained from a lab-scale fluidized bed.Experiments were performed with sand as fluidized particles and in temperatures from ambient up to 600 ℃ with superficial gas velocities of 0.29,0.38 and 0.52 m/s.Considering the behavior of bubbles and comparing with frequency domain analysis,it was concluded that S-statistic is a reliable method for characterization of fluidization process behavior at different temperatures. The influence of temperature on fluidization was investigated by a statistical chaotic attractor comparison test known as S-statistic. After calibration of the variables used in this method, the S-test was applied to the radioactive particle tracking (RPT) data obtained from a lab -scale fluidized bed. Experiments performed with sand as fluidized particles and temperatures from ambient up to 600 ° C with superficial gas velocities of 0.29, 0.38 and 0.52 m / s. Considering the behavior of bubbles and comparing with frequency domain analysis, it was said that S-statistic is a reliable method for characterization of fluidization process behavior at different temperatures.