For the need of future airspace window (FAW) to intercept the terminal anti-ship missile. Taking the typical anti-ship missile as example, this paper proposes basic steps for future airspace window to intercept the terminal anti-ship missile. Then taking use of statistical simulating methods to simulate the kill probability of future airspace window and comparing the probability to the kill probability under the condition of concentrated firing method. The simulation example shows that the kill probability of future airspace window is higher than concentrated firing method.