Abstract: This paper adopts model test to examine the mechanism of reinforcement enhancing backfill-soil slope stability and explores the instability characteristics of reinforced soil retaining wall model for the reinforced soil retaining wall in the applicability of an open pit mine slope, and further compares and analyzes the reinforcement effect of the different reinforced schemes on the open pit dump slope and slope stability state in different working conditions (continuous rainfall, earthquakes, drainage conditions). The results showed that the slope stability was improved obviously by appropriate reinforcement under different conditions. The first level is the key of the slope prevention and control, proper added reinforcement can effectively decrease local slump and overall instability of the slope under the condition of heavy rainfall, and the effect of geotextile reinforcement embedded solid can increase seismic performance obviously compared with the results of computing.