Atomic absorption spectrometry ( AAS) , inductively coupled plasma atomic emission spectrome-try (ICP-AES) and ion chromatography (IC) were used for determining the potassium, sodium, calcium and magnesium ions in precipitation .As compared to the detection limit , precision, accuracy and recovery rate , and the determination results of precipitation samples were analyzed by t test.The results showed that , the three methods could meet the requirement of quality control , there was no significant difference among the determina-tion results.Compared with the national standard method of AAS , ICP-AES method and IC method were more simple in operation and simultaneous determination of multiple elements were available .%采用原子吸收光谱法（AAS）、电感耦合等离子体发射光谱法（ICP-AES）和离子色谱法（IC）分别测定降水中的钾、钠、钙、镁，对检出限、精密度、准确度和加标回收率等指标作比对，并对降水样品的测定结果进行t检验。结果表明，3种方法均能满足质量控制的要求，测定结果之间无显著性差异；与国标方法AAS法相比，ICP-AES法和IC法操作更简单，并可实现多元素的同时分析。
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