Abstract: In order to clarify dimple induced vortex structure, the fully developed flow between two plane, with a single dimple of classical depth to print diameter ratio of 0.2 placed on the below plane, is simulated with RANS in Fluent. The generation, development and breakdown of vortex structure are analyzed with the Zhang Hanxin's theory of vortex motion bifurcation along its axis. And the vortex induce effect after dimple is examined. It is found that the separation belong to a closed separation, in the separation line singular points distribute in spiral/saddle/spiral regularly. When the spiral separation point is generated, wall vorticity is converged to the spiral point and raised in spiral. So the tornado-like vortex is generated perpendicular to the wall. Symmetric tornado-like vortex is closed in symmetric plane, and a half vortex ring is generated. The half vortex ring experienced steady spiral rising, becoming unsteady in the viscous dissipation and viscous diffusion, and finally breakdown in the strong adverse pressure gradient. After the vortex breakdown, vorticity dispersed and weak longitudinal vortex is induced in the dimple wake which induces upwash in center and downwash in two sides. Rotating in the same direction with longitudinal vortex, induced by upwash in the dimple two sides, edge vortex assisted to enhance convection after dimple.