This paper presents an improved model for high density gas-solids stratified pipe Row, in which the particle-particle interactions between the suspension and the sliding bed are taken into account by introducing suspended particle distribution coefficients, and examines the transition of stable stratified flow. Furthermore, phase diagram, distribution of suspended particles, solids concentration and velocity are predicted by the present model. It is found that particles begin to drop out of the gas phase at the theoretical saltation point at which the velocity is higher than that at the Rizk saltation point. The turning point in a diagram of dimensionless sliding bed height versus Froude number is close to the Rizk saltation point, while the Muschelknautz and Wojahn critical point is reasonable as the lower limit of the stable stratified Row of fine particles. In the phase diagram, the minimum pressure-drop point is to the left of the Rizk saltation point. Solids concentration in stable stratified flow is much lower than that of its loosely packed bed. In suspension, at most 25% of suspended particles saltate over the surface of the sliding bed. Velocity ratios of solids-to-actual gas and sliding bed-to-superficial gas increase with Froude number except at very low Froude numbers.