Abstract: Soil reinforced with horizontal-vertical(H-V) inclusions orthogonally is a new concept of reinforced soil.In the H-V reinforced soil,besides the conventional horizontal inclusions,vertical reinforced elements are also placed on the horizontal ones.A series of laboratory triaxial compression tests on sand specimens reinforced with H-V orthogonal inclusions were carried out.Particle flow code(PFC),based on the discrete element method(DEM),was introduced to simulate the triaxial tests.The macro stress-strain relation of the sand specimens reinforced with H-V inclusions was reproduced and verified by PFC2D model,and the fundamental mechanism was also analyzed.From the numerical simulation of PFC2D,the occurrence and propagation of shear band were studied and some useful conclusions were drawn.