In order to study on safe mining of the safety pillar under the ore dressing workshop in Chenchao Iron Mine,by using simulation experiment with similar materials,two control mining scheme of the safety pillar were studied,one is room and pillar mining combined with sublevel caving without sill pillar,the other one is sublevel caving without sill pillar.According to the monitoring data of strata failure and ground surface deformation from simulative mining of the safety pillar,the change laws of stress and ground surface displacement were analyzed.The results showed that if the first mining scheme is applied to the mining of the safety pillar,the safety of the ore dressing workshop is not affected within the period of removing it.The study provides a theoretic guidance for the mining of safety pillar.