research the fluidized bed gas-solid two-phase flow fluidization state, measuring and analyzing the pressure fluctuation signal in the fluidized bed is one of the main research methods. Recently, using the pressure fluctuation signal of wind caps to replace the wall pressure signal has become a research hotspot. In this paper, the cold bubbling fluidized bed experimental device is used to collect the static pressure fluctuation signal of the hood inlet at different positions of the air distribution plate under different air volume, and analyze the correlation problem of the overall pressure signal of the hood. Firstly, the signal time domain diagram and box plot are analyzed. Then the principal component analysis method is used to calculate the correlation of the hood pressure fluctuation signals at different locations. Finally, the wind pressure signal independence is used to analyze the influence of different air volume on the fluidization state in the bed. It is found that different bed materials will affect the pressure of the hood in the fluidized bed; the pressure signal of the hood will remain irrelevant with the change of air volume; the fluidity of the bed can be monitored by the pressure fluctuation signal of the hood at different positions. The proposed method is proved to be practical.