Abstract：The composed rock beam model for movement of overlying strata in stope is proposed. The key stratum of strata movement，the strata combinations of ground control and the separated bed are unified in this model，and a unitive criterion for determining the key stratum，the strata combinations and the separated bed is founded with an example analyzed. The applications of the composed rock beam model in ground control，surface subsidence control and gas prevention in coalmine are studied deeply. This model provides a unified idea and method for study of pressure in longwall mining and strata movement.
