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A two-dimensional discrete element model has been developed for the geosynthetic soilbag. The soils filled into the bag was modelled as unbonded particles using the linear contact model, and the flexible bag was modelled as overlapping bonded particles using the linear contact bond model. The micro-parameters of the soils and the bag were determined using biaxial tests and a tensile test data, respectively. To obtain the frictional coefficient between bags in PFC, shear model tests on overlapped bag particles were conducted. The results were also compared with that made of non-overlapping particles. The compressive strength properties of soilbag were studied by biaxial compression model tests on a soilbag. The simulation results were then verified by comparing with the theoretical results.