The turbulent swirling gas-particle flows with swirl numbers 0.47 and 1.5 are simulated using a unified second-order moment (USM) (two-phase Reynolds stress equations) and a k-epsilon -kp two-phase turbulence models. The results are compared with experiments. Both two models can well predict the axial time-averaged two-phase velocities in case of s = 0.47, but the USM model is better than the k-epsilon -kp model in predicting the tangential time-averaged two-phase velocities of strongly swirling flows (S = 1.5). The anisotropic two-phase turbulence can well be described only using the USM model. The results give the difference in flow behavior between weakly swirling and strongly swirling gas-particle flows.