The behavior of mechanically stabilized earth walls (MSE) with modular block facing and geosynthetic was investigated with numerical model that simulate progress of the wall, layer by layer until the desired wall height is reached.. The three-dimensional finite difference program Fast Lagrangian Analysis of Continua (FLAC3D) version 3 was used to carry out the numerical analysis. The material properties were based on data reported in the literature, which represents typical values used in the design practice.The paper describes a series of numerical models that were simulated with the combined effects of different controlling factors on the behavior of MSE walls under surcharge load. The numerical model was developed using a commercially available finite-difference software package together with the Mohr–Coulomb elastoplastic constitutive model for the soils. The numerical model was calibrated against numerical analysis. The walls were 6 m in height and were reinforced with two different polypropylene geogrid reinforcement materials, a polyester geogrid and a welded wire mesh. Numerical models werecarried out with the same modular block facing, and backfill soil material. An extensive parametric study that included more than 50 numerical models were then performed to investigate the influence of design factors such as reinforcement stiffness, reinforcement spacing, and backfill soil compaction induced stress, and surcharge load on MSE wall performance. Results include the facing displacement, vertical deformation and lateral earth pressure. Numerical results show the magnitude of lateral displacement decrease with increasing reinforcement stiffness, and decreasing the vertical spacing while the vertical deformationincreased significantly with an increase in compaction load, surcharge load. It was found that finite difference procedure was able to simulate the static response of MSE wall very well.