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To study the bending strength of mass concrete under dynamic loading.the pure bending zone of three-graded concrete beam is considered as a three-phase composite composed of atrix.aggregate and interface between them on meso-level.Dynamic constitutive model considering strain-rate strengthening effect and damage softening effect is adopted to describe the cocrete and meso-element's damage.The failure mechanisms of beam under impact loading.triagle wave load.dynamic load coupling with initial static loading were sireulated by using displace-ment-controlled FEM.Furthermore.stress-strain curve of the specimens and their dynamic bending strength were obtained.The results obtained from numerical simulation agreed well with experimental data.