Abstract: Upon the morphological characteristics of ordinary strength concrete under mode-I fracture, a three-dimensional meso-fracture theoretical analysis model was established by considering the heterogeneity of its material composition and the intergranular failure mode at the mesoscale, for the study of concrete fracture failure behavior and its macroscopic mechanical properties. The model adopts the basic theoretical framework of meso-mechanics, assuming that the concrete material is composed of aggregate, mortar, and interface. In order to simplify the theoretical derivation, elastic sphere was used to represent aggregate, and typical bilinear elastic constitutive model was used to characterize the mechanical behavior of mortar and interface. The established theoretical analysis model can describe the morphological characteristics of the fracture surface of ordinary strength concrete under the assumption of unique fracture surface and give the macroscopic fracture parameters quantitatively. The work presented can provide a research framework for the subsequent establishment of concrete fracture analysis model upon the transgranular failure mode and, lay a foundation for the final establishment of performance-based concrete material mix design theory.