Abstract:PFC2D is adopted to simulate geosynthetics pullout tests and the interface between geosynthetics and soil with emphasis on the meso-analysis. Suitable mesoscopic discrete element parameters are selected and calibrated so that the results of the simulation fit well with those of the laboratory experiment. Parallel bond is employed to simulate geosynthetics;and elliptical clump comprised of three disc particals is used as soil partical. The numerical results show that the interface thickness is to be approxiately 6 to 7 times of the average particle diameters;and the particles in the zone undergo larger relative displacement;the porosity increases,the coordination number decreases. PFC2D is one of the most perfect numerical tools to study the interface between geosynthetics and soil from mesoscopic point of view.