The air battle process of fighter planes appears as four moments: search, approach, attack and withdraw. Each stage activity of air battle contains different purposes, contents and methods, but each result has the important influence on air battle. Both sides in the battle all hope to choose the most appropriate opportune moment to blast off, any too early or unduly late blast-off is disadvantageous to one's own side. In this paper the quantitative and qualitative analyses about the stage from approach to attack in one to one air battle are done first and the air battle decision model of two to two is discussed then.