Abstract: In order to investigate the low cycle fatigue life and damage evolution of Q690D high strength steel, monotonic tensile and low cycle fatigue tests of Q690D high strength steel were tested, the parameters of the Manson-Coffin model were calibrated, and the low cycle fatigue response characteristics were analyzed. Afterwards, a low cycle fatigue damage evolution model was developed upon Continuum Damage Mechanics, and the damage variables were coupled to the ABAQUS finite element software through the USDFLD subroutine to achieve a numerical simulation of the low cycle fatigue life and damage evolution of the steel coupons. Based on this, the damage evolution and distribution of Q690D high-strength steel are analyzed. The validity of the model developed is further verified by the low cycle fatigue test data of relevant steels in existing studies. The results show that Q690D high-strength steel exhibits cyclic softening characteristics under cyclic loading; that the analytical results of the model are in a good agreement with the test data, and that the method enables to achieve the effective analysis of damage evolution and damage distribution under low cycle fatigue loading. The research work provides a data reference for the study of Q690D, discusses the fatigue damage evolution of steel from the perspective of continuous medium mechanics, and contributes a technical and theoretical support for the low cycle fatigue damage analysis of steel structures.