Abstract: Experiments were conducted extensively for the flow field of a EPVC-IA Vane-guided cyclone tube developed by our institute, the three dimensional components of velocity and static pressure drops were determined. The configuration of the cyclone tube, especially the geometrical parameters of the split-flow core tube, was found to have great effect on the flow field. Mathematical models for ideal flows as well as for turbulent and viscous flows in this cyclone tube were derived from the basic equations of the fluid flow. A series of analytical solution of the three dimensional vortex flows in this cyclone tube were deduced and showed good agreement with experimental data.