Abstract: Characteristics of four kinds of typical flow regimes are discussed in this paper. Thinking of the actual physical mechanics in a trickle bed reactor, a new experimental method is proposed to detect the typical flow regimes. Based on the frequency spectrum of the local conductance variance, characteristics of different flow regimes have been discovered. A frequency of about 3Hz with large amplitude exists in trickling flow, pulsing flow and spraying flow, and the frequency spectrums of this three categories of flow regimes are different from each other within 0~3Hz. Under bubbling flow, the main component of frequency is distributed between 0 and 3Hz.