Abstract: The direct impact of the landslide debris flow on the resistive structure often produces higher peak impact and impact energy is often generated, which may result in easy failure and losing effectiveness. However, the guiding structure can slow down the impact effect and improve the structural impact resistance by changing the path of motion of the debris flows. Therefore, we used 3-D discrete element simulation software, whose parameters are calibrated by comparing the results of the rest angle of repose test and the numerical simulations. Numerical simulation analysis was studied with three different guiding structures (concave arc, straight line, convex arc) as variables. The results indicate that the impact force of debris flow is effectively transformed by concave circular arc structure B1, in which the structure receives the least normal force and the largest tangential force. The guiding effect of the concave circular arc structure B1 is the most obvious. After three different guiding structures, the collision and friction between the particles and the chute are the main reasons for the decrease in the kinetic energy of the particles, and the effect of the three different guiding structures on the dynamic energy dissipation of the particles is not significant. The guiding structure has a significant effect on the particle volume distribution. The main affected area is near the foot of the slope, and the accumulation area after the guiding structure and the particle volume distribution are not significant. The study of the impact effect and the accumulation characteristics shows that the concave arc structure is optimal, and can provide the reference for the design of shock resistance engineering protection of debris flow.