According to the requirements of “Evaluation and Expression of Uncertainty in Measurement” (JJF 1059.1-2012),evaluating the uncertainty in measuring of Lime effective calcium oxide and magnesium oxide content,analyzed the main factors influenced the lime effective calcium oxide and magnesium oxide content were measurement repeatability,the concentration of hydrochloric acid standard solution and the volume of hydrochloric acid standard solution titration. The evaluation was beneficial to the quality control in the process of test and improving the accuracy of the test.%根据《测量不确定度评定与表示》（JJF 1059.1－2012）的要求，对石灰有效氧化钙和氧化镁含量的测量结果不确定度进行评定，分析出影响石灰有效氧化钙和氧化镁含量的主要因素是测量的重复性、盐酸标准溶液的浓度及滴定盐酸标准溶液的体积。通过评定有利于在试验检测过程中进行质量控制，提高试验检测的准确度。
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