本文提出一种利用循环应力应变曲线迅速测定钢筋疲劳极限的新方法。列出了三种钢筋循环应力应变曲线的实测结果和疲劳极限的估值区间。用常规法直接测得的极限值在此区间内。新法的测定速度较常规法的快几十倍,而且一般不需用特制的夹具。 This paper presents a new method to rapidly determine the fatigue limit of steel bars using cyclic stress-strain curves. The measured results of the three types of rebar cyclic stress-strain curves and the estimated range of the fatigue limit are listed. The limit value directly measured by the conventional method is within this range. The new method can measure several times faster than conventional methods, and generally does not require special fixtures.