An annular jet model was proposed to improve the turbo-charge and anti-drag effect of base bleed in tail flow field. Two-dimensional axisymmetric Navier-Stokes equations was computed using a finite volume scheme, and the tail flow field of base bleed was simulated. The simulation results were validated with experimental data well. Based this, the influence annular jet upon the tail flow field of base bleed was investigated. Results show that the base pressure of annular jet model is always higher than that of circular jet model with the increase of the injection parameters. Compared with circular jet, annular jet can weaken the strength of annulus recirculation. It makes bleed gases flow into the shear layer more easily and can avoid the occurrence of the ejector. The smaller the distance between the annular jet and the base edge, the better the benefits of base bleed.