In this paper, Gansu provincial committee and government unified arrangements Minxian-Zhangxian MS6.6 Earthquake recovery and reconstruction work as an opportunity, by collecting field data and reconnaissance site conditions, it can grasp the site characterization of relocated concentrated settlements. After the field investigation, the author digged loess samples from the slope, tested the static test in the laboratory, got the relevant parameters from the soil physical and mechanical properties, used these parameter as the basic parameter for numerical modeling, used Minxian seismic wave to simulate the dynamic mechanical properties of the slope under earthquake action, the safety factor of the slope was obtained at last.On the basis of the calculation of the safety factor, combined with the "Specification of Geological Investigation for Lanslide Stabilization" and "Code for seismic design of buildings", the paper will give the site's landslide risk assessment, the slope is under steady state under static conditions, there is a possibility of further landslides, it is in an unstable state under dynamic conditions, especially in the case of strong earthquakes, it is likely to cause landslides further collapse, And for the actual site security issues that have arisen, it will also present a comprehensive damage prevention countermeasures. Considering the proposed avoidance, another safe and reliable site for placement, in order to avoid greater losses.