Axial variation and distribution of bubble properties were investigated in a gas/liquid countercurrent fluidized beds (0.152 m×2.5 m) with relatively low-density particles. Chord length, rising velocity and frequency of rising bubbles in the beds were measured and determined by means of dual resistivity probe method. The axial variation and distribution of bubble properties were well visualized by probability number density function, by which the mean value of bubble properties were determined. The mean value and distribution of bubble chord length increased profoundly with increasing axial height above the distributor as well as gas and liquid velocities. The rising velocity and its distribution of bubble also increased consider ably with increasing the axial height as well as gas and liquid velocities. But, the frequency of rising bubbles decreased with increasing the axial height. The bubble properties such as bubble chord length, rising velocity and frequency were well correlated in terms of the axial position, gas and liquid velocities, and particle density within this experimental conditions.