Abstract: In order to analyze the influence of concrete meso-structure on concrete fracture parameters,the embedded program of 0-thickness bonding element was developed based on ABAQUS platform,and the meso-structure bonding crack model of concrete was established to simulate the fracture process of hydraulic two-grade concrete in the literature and verify the accuracy of the numerical model. On this basis,combined with the boundary effect model,the fracture parameters of concrete are predicted,and the influences of aggregate particle size and aggregate shape on the fracture parameters of concrete are analyzed. The results show that the meso-bond crack model of concrete can accurately simulate the whole process of concrete damage and fracture,and the relative error between the key points of load-crack opening displacement curve obtained by numerical simulation and the average value of key points obtained by experiments in the literature is within 10%. The numerical simulation results show that the relative error of tensile strength and fracture toughness of concrete calculated by boundary effect model is less than 7% compared with that calculated by standard formula in the literature. With the increase of the average particle size of aggregate,the tensile strength of concrete decreases gradually,and the fracture toughness increases gradually. The research can provide reference for the prediction of concrete fracture parameters.