In this article, the relationship between the interfacial debonding length of anchor rod and the number of cyclic loading is obtained, based on the debonding criterion and the Paris formula. Under the help of the relationship, the author analyzed the debonding length of the anchor rod, which joins the bearing platform of the spread foundation and the new additional parts together. And then evaluate the fatigue life of the structure. The result shows that the damage caused by interfacial debonding under fatigue loading is very serious, compared with that done by the pure mechanical damage, which is under the condition that the interface bonds perfectly So it is necessary to considering the influence of interfacial debonding to forecaste the fatigue damage of the anchor system.
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