Abstract: Based on combination of total finite element tearing-interconnecting method and gradient-enhanced continuum damage model, aiming at the high-precision requirements of the damage sub-domain simulation and the uncertainty of concrete damage propagation path, through introducing the sub-domain adaptive updating method based on non-local equivalent strain, and incorporating the sub-domain update misjudgment correction, the high-precision finite element mesh adaptive update of nonlinear sub-domain during concrete damage and failure process simulation were realized. Moreover, numerical tests having different domain meshing numbers and domain meshing forms were carried out on L-shaped concrete specimen. The results show that there was no sub-domain meshing sensitivity for the model. When the number of sub-domain subdivision increased or the meshing mode of sub-regions was adapted to the damage propagation path, the number of adaptive updating of the sub-domain with high-precision finite element mesh decreased, and the calculation scale of the model was significantly reduced. In addition, the increment of sub-regional interface nodes had little effect on the reduction of calculation scale, and the overall calculation efficiency of the model was significantly improved. This study can provide reference for concurrent multi-scale numerical calculation of concrete damage analysis.