[Purposes] This study aims to investigate the intrinsic influence mechanism of coarse aggregate angularity, a key morphological characteristic, on the macroscopic compressive performance of cement-stabilized macadam (CSM) from a meso-scale perspective. The research seeks to provide a theoretical basis for optimizing material performance through the control of aggregate morphology. [Methods] An integrated approach combining physical experiments and particle flow numerical simulation was adopted. The angularity of two types of coarse aggregates, crushed pebbles and limestone crushed stones, was quantitatively characterized using digital image processing technology. Based on the actual aggregate contours, the micro-mechanical parameters for the mortar, interfacial transition zone (ITZ), and coarse aggregate phases were determined through parameter inversion techniques. This facilitated the construction of a mesoscopic numerical model accurately reflecting the material"s three-phase structure. Virtual unconfined compressive tests were conducted to systematically compare and analyze the influence of aggregates with different angularities on the model"s macroscopic mechanical response and mesoscopic crack evolution patterns. The simulation results were compared and validated against indoor physical test results. [Findings] In terms of macroscopic mechanical properties, both physical and simulation tests indicated that increasing the angularity of coarse aggregates significantly enhances the unconfined compressive strength of CSM specimens (the strength of limestone crushed stone specimens was 5.5% higher than that of crushed pebble specimens). However, this improvement comes at the cost of reduced specimen stiffness. At the meso-level,