Four﹣point bending fatigue test method in strain﹣controlling mode is used to research the fatigue characteristic of three kinds of steel bridge pavement material.The result is proposed by analysis the relationship between the stiffness modulus,lag Angle and fatigue performance of three kinds of as﹣phalt mixture under different strain levels.The result shows that the mixture with small initial stiffness modulus has better fatigue performance.Under the same strain level,the order of lag angle is SMA10 >GA10 >EA10 and the mixture with big lag angle has better fatigue performance.For the same material, the fatigue life decreased with the increase of the strain level and the order of fatigue life is SMA10 >GA10 >EA10.%通过应变控制模式下的4点弯曲疲劳试验方法分析了3种不同钢桥面铺装材料的疲劳性能。通过分析不同应变水平下3种不同沥青混合料劲度模量、滞后角与疲劳的关系；得出在3种不同的钢桥面铺装材料，其初始劲度模量越小，疲劳性能越优；同一应变水平下，滞后角大小顺序分别为 SMA10＞GA10＞EA10，且滞后角越大，疲劳性能越优，同一材料，疲劳寿命随着应变水平的增加而减少，且疲劳寿命依次为 SMA10＞GA10＞EA10。
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