Abstract: Study of the rock burst mechanism and its control technology in sublevel caving mining face under isolated top coal is done by applying overlying strata spatial structure academic viewpoint. According to the key stratum lithology、layer place、range and other factors, the key stratum spacial structures are divided into big structure of overlying strata and main roof structure leading to limited pressure. rockburst mechanism in island top coal stope is: ① formation process of ?-shaped spatial structure in sublevel caving mining face is the process of gradually increasing pressure, and that is the rockburst power source in this period; ②After the formation of the lowest ?-shaped spatial structure of the main roof, with the face advancing, the main roof block slides and which cause the rock burst phenomena. Through the study of the controlling effect on the key stratum spatial structure movement by segmented pressure theory, the instability of basic roof structure theory and hard roof prefracture theory, the ways and means of overlying strata spatial structure theory analyzing and reducing the rate of caving in different phases, hard overlying strata prefracture technology, microseismic monitoring technology overburden rock hard rock rupture of to prevent rock burst occurred are proposed.

Key words: top coal, sublevel caving mining face, impacting mining pressure, rate of release