Traditional techniques of soil and water conservation monitoring cannot fully meet the requirements of accuracy, timeliness and integrality in production and construction projects monitoring. Taking the new Chongqing-Wanzhou railway as a study case, we introduced low altitude UAV RS into the key sections monitoring. Compared with traditional techniques, the low altitude UAV RS has advantages of high precision, real time, comprehensiveness, and the disadvantages are low vertical precision, heavy information extraction workload, weather dependence, and high investment.