Abstract: Beichuan County, Sichuan Province, the 512 earthquake very severely affected counties,5.12 earthquake in Beichuan economic development into the lowest point in history, the annual flood season or after heavy rainfall have a great impact on the economy of Beichuan, only 2013 affected by heavy rainfall economic losses of several hundred million dollars, the question is whether you can deform before the disaster to disaster, there are certain block and protection is extremely important to avoid causing casualties and property loss. Based on this understanding, the survey found that in the actual collapse reached a preliminary preventive effect in the formation process. Before the collapse occurred were not set up protection works, takes place in the form of tall trees rely on a multi-row piles natural forest, succeeded in preventing the collapse of physical destruction of life and property of residents, and therefore causes the collapse of the county's analysis basis, not anti-sliding and rolling in the rockfall site, and given the small rockfall kinetic energy, analyzed and summarized on the site of a small bounce height planting protection works, on the one hand to protect the lives and property of residents, on the other hand can be green nature, such as can be achieved successfully serve two purposes.