Measurement uncertainty is the ultimate measure of measurement errors, and is the characteristic parameters of quantitatively indicating the quality and relevance of measurement result. The paper analyzes the resources of influencing the uncertainty of measurement result of indication error of steel tape and makes the evaluation of uncertainty.% 测量不确定度是对测量结果可能产生误差的极限度量，是定量表示测量结果质量优劣并与测量结果关联的特征参数。本文分析了影响钢卷尺示值误差测量结果不确定度的来源，并进行不确定度评定。
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