In the development era of wing-in-ground effect vehicle, there remains two major technical issues: first, in the process of taking off, the lift-drag ratio is too small to lift the aircraft body out from the water rapidly; second, when landing, aircraft`s body may crash heavily into the water, which wears it out. To solve above issues, according to the hull theory, wing design theory and the Theodore Von Karman water impact theory, this paper designs a new hydro-ski applied in wing-in-ground effect craft. and uses CATIA to draw 3D model of the hydro-ski, and the FLUENT to figure out the craft`s hydrodynamic characteristics. This research concludes that lift coefficient and drag coefficient of the hydro-ski increases as the angle of attack increases. In addition, the lift-drag ratio curve is shown as a parabola, peaking at 5°. In the meantime, when the incoming flow velocity is 2m/s, the lift coefficient, drag coefficient and CL/CD is larger than that of the others. To conclude, the hydro-ski helps lift the craft body out from water rapidly when taking off and reduce impact force to the hull when landing.