From the definition, purpose and the basic principle of rounding off for numerical values, and combined with the cases of rounding off for numerical values of each performance determination result in the GB/T 228.1-2010 "Metallic Materials Tensile Test 1st Part: Room Temperature Test Method", this paper explains the method of the rounding interval of rounding off for numerical values.%文章从数值修约的定义、目的及修约的基本原则出发，结合GB/T 228.1-2010《金属材料拉伸试验第1部分：室温试验方法》中各性能测定结果的数值修约实例，详细对各种数值修约间隔的修约方法做逐一说明。
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