In order to analyze and discuss misfire causes of the detonator in the underground mine blasting operation, with the establishment of the similar model of the cross section detonator.lasting net line in the underground mine roadway, the water bearing rate and the electric conductivity performance tests of coal were individually conducted. The underground series blasting net line grounding test and the detonator foot line connection mode influence test showed that the higher of the coal water content rate, the lower the electric resistance value would be. The grounding electric current occurred at the grounding location in the blasting net line would reduce the electric current in the completed net line. The different connection mode of the detonator foot line would directly increase the total electric resistance of the completed net line. All above conditions would reduce the total electric current of the completed blasting network which would cause a misfire by the insufficient firing current of the detonator.%为了分析和探讨煤矿井下爆破作业中雷管拒爆的原因，通过建立井下巷道断面雷管爆破网路相似模型，分别进行了煤体含水率与导电性能试验、井下串联爆破网路接地试验和雷管脚线联结方式影响试验，得到煤体含水率越大，电阻值越小；爆破网路中出现的接地点会产生接地电流降低整个网路中的电流；雷管脚线联结方式的不同直接增加整个网路的总电阻的结论。这些情况都会降低整个爆破网络中的总电流，使得雷管起爆电流不足引起拒爆。
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