The trajectory model of dispersed drops and the model of basic flow for drop motion between two inclined parallel plates are derived and the calculation is optimized.The analytical results of numerical simulation indicate that with the variation of thickness of trickling film and plate distance

the density

viscosity and interfacial tension have different influences on the drop motion.The viscosity always has a great effect on the drop coalescence

while the effects of density and interfacial tension depend on the flow field.The variation of density

viscosity and interfacial tension may make the drop motion rotate tendentiously in the clockwise or anticlockwise direction with the axis parallel to a nearby plane wall. Hence

the density and viscosity may improve the coalescence condition in a certain extent.The simulation results match the experimental data well.The introduction of the basic flow is helpful for the model to reproduce the drop motion characteristics better in the stratified two-phase flow.