Abstract: In view of the slop subsidence,local collaplse of the roadbed of a highway under the conditions of hevay rainfall,through the analysis of slope sliding mechanism,the causes of subsidence,collapse of the roadbed is discussed,so as to provide theoretical basis for slop governance.According to the relationship between difference rainfall duration and safety coefficience of slope stability,the slope destruction process is analyzed,and the slope instability stage is determined,the integrated governance scheme based on slope sliding and instability stage is proposed,besides that,the technical economic comparison of the governance scheme is done,so as to provide reliable reference for the treatment of slope instability of roadbed.

Key words: Heavy rainfall, Cause of sliding, Instability stage, Slope stability, Safety coefficience, Goverance scheme