Abstract: In order to improve the capacity of design, analysis and life prediction of fusion reactor component for designer, Chaboche constitutive model of coupled damage was conducted by the combination of Chaboche unified constitutive model and damage model. Based on the radial return method and backward Euler integration, implicit stress integration algorithm was researched and a new expression of consistent tangent modulus was also derived for that model. The Chaboche constitutive model of coupled damage was implemented into the finite element program ABAQUS, and then was used to simulate four kinds of deformation. The results show that the simulated values are very close to the experiment data.