Abstract: The roadway surrounding rocks deformation of stope bottom structure of lines to 50 and 52 of -760 m level of Dongguashan copper mine are monitored.The cumulative displacement and deformation rate are adopted so as to analyze the stability of roadway surrounding rocks.Besides that,the stability of surrounding rocks of roadway is evaluated by roadway surrounding stability index.

Key words: Multi-step stoping, Stability evaluation of the bottom structure, Internal displacement of surrounding rocks, Vault subsidence