A newly developed differential lightning electromagnetic pulse instru ment is introduced. Based on the cloud-to ground lightning modulation experiments, the paper further adopts a kind of lightning orientation method in the case of default lightning polarity. The lightning electromagnetic pulse instrument is installed on the top of a 6-floor building to test the horizontal electric field from natural lightning on the ground. The measured flash horizontal electric field waveforms show that, it can not only suppress the common mode interference effectively, but also can be used for lightning orientation.%对新近研制的差分式雷电电磁脉冲水平电场仪作了简要介绍，通过实验室条件下的地闪模拟实验，确定了采用该电场仪判定闪电电流方向及实现对放电通道定向的方法。将该电场仪置于六层楼顶上用于自然雷电电磁脉冲水平电场的测试，测量结果表明：该电场仪不仅有效地抑制了垂直电场引入的共模干扰，且实现了对地闪放电通道的定向。
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