A new method called structural catastrophe analysis was applied to the analysis of pressure fluctuation time series with chaotic and fractal characteristics in gas-solids fluidized bed.In every type of fixed bed，bubbling bed，turbulent bed，fast fluidized bed and pneumatic conveying stage，pressure fluctuation signals were sampled and dynamic exponents were solved.The changes of Tmean and Tmax in different types of fluidized bed were analyzed and summarized.It was concluded that Tmean and Tmax can indicate different types of fluidized，and Tmax can also be recognized as a new characteristic parameter in addition to correlation parameters，LE exponent and K entropy.