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通过几种非恒幅载荷疲劳寿命的计算，得出基于Ｐａｒｉｓ公式的等效载荷的ＣｙｃｌｅｂｙＣｙｃｌｅ方法计算疲劳寿命是一种有效的工程方法，它具有精度高、理论严密、易于实现等特点，同时非恒幅载荷下含表面裂纹对焊接头疲劳试验也证实了这个结论。
By calculating the fatigue life of several non-constant amplitude loads, the CyclebyCycle method with equivalent load based on the Paris formula is obtained. It is an effective engineering method to calculate the fatigue life. It has the characteristics of high precision, rigorous theory and easy realization. This test is also confirmed by the fatigue test of welded joints with surface cracks under constant amplitude load.