通过条文对比和计算，分析了各国规范在设计冰荷载取值及修正，覆冰时风荷载的计算，不均匀覆冰工况和断线工况等方面的异同。通过比较发现，我国设计冰荷载的导线直径修正系数与IEC标准吻合较好，而导线高度修正系数大于IEC标准，偏于安全。由于线路最小风速的规定，我国覆冰同时风速与按IEC标准、CSA标准规定的计算值吻合较好。由于基准冰荷载选取和覆冰率的不同，我国以50年重现期为基准的不均匀覆冰荷载与IEC标准以500年重现期为基准时吻合，达到甚至超过CSA标准150年重现期的水平。我国一、二和三类杆塔的断线覆冰率亦与IEC标准、CSA标准中500年、150年和50年重现期对应的断线覆冰率相吻合。

By means of provision comparison and calculation, similarities and differences in ice load designed and its modification, wind load combined with icing, non-uniform ice load and wire broken conditions among different standards are analyzed. Results show that correction factor for conductor diameter in Chinese standards agrees with that of IEC standard, while the correction factor for conductor height is higher than that of IEC standard. As for the minimum wind speed rule, the wind speed combined with icing in Chinese standard agrees with that of IEC and CSA standards. Because of the differences in basic ice load and ice covering ratio, uneven ice load corresponding to a return period of 50 years in our standard agrees with that corresponding to a return period of 500 years in IEC standard, also reaches and is even higher than that in CSA standard corresponding to a return period of 150 years. The ice covering ratio of wire broken in our standard agrees with that in IEC and CSA standards corresponding to a return period of 500, 150 and 50 years respectively.