介绍了几种天线增益的测试方法，并根据高功率微波(HPM)天线的特殊性，提出了一种窄脉冲激励下HPM天线增益测试方法。利用直接功率测量方法，将窄脉冲信号源作为发射信号源，通过标定不同脉冲宽度下接收天线的最大接收功率，开展实验研究，测得窄脉冲条件下天线的增益值。测试结果表明：在脉冲宽度大于25 ns的微波脉冲激励HPM天线时，天线增益测试结果与连续波条件下天线增益测试结果相同。

The paper presents several ways about antenna gain measurement. Based on high power microwave(HPM) antenna particularity, the change of antenna gain was studied under different pulse widths. The experiments were conducted using narrow pulse signal resource. The antenna gain values under narrow pulse were tested by the way of demarcating the received power under different pulse widths. The experiment shows that the test results are uniform in the cases of continued wave and narrow pulse wave. The experiment proves that HPM antenna gain measurement with pulse width more than 25 ns is as effective as continue wave measurement.