Abstract: Abstract: [Objective]Landslide debris flow is a common geological disaster, which has the characteristics of large scale, long sliding distance and fast speed, and the terrain of hillside ravines and valleys will affect the trajectory of landslide debris flow and then block, turn, pile up and a series of impacts, so the landslide debris flow is not only a simple straight line path, but also by the influence of the terrain factors, the path of its movement is complex and varied.[Methods]This paper is mainly based on the aggregation behavior in different motion trajectories of landslide debris flows, and uses EDEM software to analyze the motion impact and accumulation characteristics of symmetric aggregated landslide debris flows in different aggregation angles.[Results]The results of the study show that: (1) the effect of the polymerization angle on the movement velocity: the larger the polymerization angle, the smaller the Vy, the higher the degree of separation of the landslide debris flow, and the longer the landslide sliding time; (2) the effect of the polymerization angle on the accumulation morphology: the larger the polymerization angle, the landslide is stabilized at the foot of the slope, and the morphology of the accumulation zone, the length of which is increased on the slide side, and the height of which is decreased at the blocking structure; (3) the effect of the polymerization angle (3) Effect on impact performance: the larger the polymerization angle, the lower and later the peak impact force on the barrier structure; the residual impact force after stopping the movement to form a static accumulation area is also lower, and the value of the residual impact force is also closer to the peak impact force.[Conclusion]The research results provide a fundamental role for the in-depth study of the complex path movement of landslide debris flows and a theoretical reference for the optimization of landslide debris flow control structures.