ＵＬ大电流电弧引燃性能分级是电气绝缘用塑料产品安全认证的重要检查项目。本文重点就可动电极移动速度与方向、电极材质与尖端形状、电极与被试材料间的间距、电源回路的功率因数和引燃点的终点判断等主要试验条件和性能参数进行了分析、讨论。并就降低检验结果数据的分散性，指出了试验时应该注意的事项和需要进一步提高材料引燃点的终点判断水平。 UL high current arc ignition performance grading is an important inspection item of electrical insulation plastic product safety certification. In this paper, the main experimental conditions and performance parameters such as the moving speed and direction of the movable electrode, the electrode material and the tip shape, the distance between the electrode and the tested material, the power factor of the power circuit, and the end point of the ignition point are analyzed and discussed . And to reduce the dispersibility of test data, pointed out that the test should pay attention to the matter and the need to further improve the ignition point of the material to determine the level of the end point.