Time series of differential pressure fluctuation at various axial and radial positions were obtained at various positions of a spouted bed of 0.12 m ID for operating conditions under different flow regimes, and were analysed to give correlation dimension and Kolmogorov entropy. It has been found that both correlation dimension and Kolmogorov entropy can describe the flow structure of gas-solid two-phase flow in different spouted bed flow regimes. Two correlation dimensions and two Kolmogorov entropies were obtained in the unstable spouting regimes, while only one correlation dimension and one Kolmogorov entropy were found for the stable spouting flow regimes.