Conductivity probe method was used to study distribution characteristics of local phase holdups in gas-liquid-solid circulating fluidized bed (CFB). The method used 856 conductivity meter which was imported from Metrohm to study the dynamic characteristics of gold concentrates CFB. It shown that local gas holdup (ε<inf>g</inf>) became smaller gradually, but local solid holdup (ε<inf>s</inf>) became larger, local liquid holdup (ε<inf>l</inf>) became larger in radial distribution in CFB. In axial distribution, ε<inf>g</inf> increase gradually, but ε<inf>s</inf> decrease, ε<inf>l</inf> decrease.
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