Research purposes：In recent years, whenever China has entered the rainy season, there will occur due to heavy rainfall formation of debris flows. This situation has caused a lot of casualties and property losses, such as the 2016 Fujian Taining debris flows killed 34 people were killed in 2010, Gansu Zhouqu large debris flow caused more than a thousand people were killed, so the management and prevention work mudslides become a top priority topographic and geologic complicated area. Mudslides have erupted suddenly, the impact energy, destructive and other characteristics, but also by the influence of topography, geology and rainfall and other complex situations, the higher strength requirements of the management project. In recent years, commonly used in slope engineering Piles of debris flow structure is widely used in project management, since the debris flow impact of dynamic load, with its stress patterns different in slope engineering, since the cost of Piles higher in the actual project often requires common use with other ancillary works. Piles of debris flow Landang paper as a research object, setting the pile retaining wall model, in conjunction with a flexible mesh, gabion placed during simulated debris flow impact chute Pile Wall, by arranging the rear of the model in Piles pressure sensors to analysis of the forces piles and piles of integrated Landang effect, the effect of drainage and dam siltation conduct research. Research conclusions：(1) The effect In the model experiment pile wall is prefect, most of the large volume of solid material can be stopped. (2) Set the gabion and flexible net in the rear piles of debris flow can be effectively reduce the impact of piles, drainage effect gabion network has its own advantages and flexibility, flexible network is better compared to the gabion, Georgia Bin compared to more effective flexible network can reduce the impact of debris flow in. (3) Piles is easy to form the rear vortex of dam foundation caused serious erosion. (4) When the silt behind the dam is full of the solid matter, it will be blocked drainage channels, drainage measures should be strengthened.