对于边炮配置的小高炮系统，左右炮横向间距较大，为减小多管射击总散布，左右炮不应完全平行，其射击线应在某点交会。需要解决的问题是交会点选在什么位置最佳？另外，当边炮作立靶射击试验时，左右炮之间大的横向间距将严重影响多管总射击密集度，在这种情况下，仍按常规方法对立靶射击结果进行检验是错误的，需要研究新的正确检验方法。本文导出了计算火炮最佳交会点的数学表达式，证明了在一定条件下边炮立靶射击结果的某种统计值遵从非中心卡方分布，并给出了边炮立靶射击结果的检验方法。

For a broadside disposition anti-aircraft gun system, the transverse distance between the left- and right-tubes is quite considerable. To reduce the total fire dispersion of the system, the right- and left- tubes should not be placed parallel. Their shooting lines should intersect at a certain point. The question is how to determine the optimal intersection point. Besides, when the broadside disposition anti-aircraft gun system is trying out, the transverse distance between the two tubes will seriously affect the total density of the multi-tube gun. Thus it would be inappropriate to test the vertical target fire effect following the traditional routine. In this paper, the expression for calculating the optimal fire intersection point is given. It is proved that statistically the vertical target fire effect of the broadside gun system has a noncentral chi-square distribution under some conditions. A test method for the fire effect is given.