Abstract: In order to study engineering rockmass instability characteristics of strip mining, taking strata structure in Fengfeng Group Wannian Coal Mine as the research object, rock physical and mechanical parameters were obtained from laboratory test, and strip mining similar simulation experiment model was established, using measurement data from total station instrument and stress strain sensor to obtain the displacement and stress change laws of strip mining engineering rock roof, coal pillar, floor as well as its instability and failure characteristics, the test results show that strip mining rock roof, coal pillar and floor were taken as a whole, any subset instability will affect the stability of strip mining engineering rock mass.