Aiming at soil and water conservation monitoring in development and construction projects, a new scheme that uses advantages of lidar and DGPS is presented for the application to reality. Some good effects of the scheme have been observed. It is proved that the scheme is a scientific and highly effective method, and thus can be widely used in development and construction projects at present. In addition, its measurement precision is much finer than traditional methods, and it is more real and more credible. The scheme can exquisitely reflect the change in shape of dregs field; easily realize the three dimensional modeling; truly realize the non-contact measurement; greatly reduce field workload and the risk. Moreover, the scheme is able to measure soil erosion of many forms, such as excavated slope, collapsed hill, and mountain landslide, and helps to promote the traditional soil and water conservation towards precision farming.