.The wavelet transform is an effective tool for studying the dynamic behavior of fluidized beds in the resolution of time variables. To understand the behavior of photocatalyst under different velocity in an annular type fluidized bed, a new analysis technique (Continuous Wavelet Transform: CWT) is applied. With the time-frequency localization characteristics embedded in wavelets, the time and frequency information of signals can be presented as a visualized scheme. By analysis of various methods for pressure fluctuation signals measured from an annular type fluidized bed, it was found that the dynamic behavior of fluidization in the annulus fluidized bed reactor was easily observed with the aid of wavelet transform.