煤矿采掘和地面爆破施工中，爆破可靠性是个重要环节。发生在网路中的不规则拒爆，可以认为是由雷管敏感度差异而造成，钝感的雷管因未获得足够的电冲能而拒爆，自在情理之中。然而，发生在串联网路中部的成组拒爆，或者只有一端爆炸的情况，就难以用敏感度差异来解释。本文介绍了有关这方面内容的实验研究工作，揭示了网路上电气参数的变化规律，分析了发生成组拒爆的原因和条件。 Coal mining and ground blasting construction, blasting reliability is an important part. Occurred in the network of irregular refuse explosion, can be considered as the difference caused by the sensitivity of the detonator, insensitive detonator because they have not received enough electric impulse to refuse to burst, at ease. However, group detonations that occur in the middle of a series network, or where only one end explodes, can hardly be explained by differences in sensitivity. This paper introduces the experimental research work on this aspect, reveals the changing rules of the electrical parameters on the network, and analyzes the reason and condition of the group rejection.