Unsteady incompressible Navier-Stokes equations are solved with a pressure correction method.A series of numerical calculations are conducted for Low-Reynolds-Number aerodynamics of an inverse Zimmerman wing.It shows that a pair of strong leading-edge vortex exist beyond the wing.They have strong effect on the inverse Zimmerman wing aerodynamics and offer high nonlinear lift and large stall attack angle.Interaction between the leading-edge vortexes results in unsteady and asymmetry phenomenon of the wing.The inverse Zimmerman wing shows a better longitudinal stability and flow-field stability.