Under the action of strong wind wave in the sea conditions of typhoon,storm surge and so on,soil seawall is often damaged or even broken.Considering the situation that the soil mass of seawall will be liquefied under the action of high water-level wave,Geo-slope software was used to calculate the safety factor for the overall sliding stability of seawall.The calculation result was compared with the safety factors calculated in other three conditions including high water level at calm water state,low water level with wave action,and low water level after liquefaction under wave action.The safety factors calculated in the four cases were 2.226,2.392,2.082 and 2.056 respectively.The results show that when the wave action is causing soil liquefaction,it doesn’t produce a significant influence on the overall stability of seawall, but it produces a significant influence on the stability of seawall which is at the low level of sea side;the destructions such as seawall breach under strong wind wave are not caused by the overall seawall sliding due to reduction of soil strength under wave action,and it’s specific mechanisms still need further study.