Abstract: The theories of "overlying strata movement law" in fully mechanized mining stope and "transferring beam" were applied to "given deformation" and "limited deformation" control design of the main roof; the calculation method of support strength and shrinkage quantity with two kinds of support working state was confirmed; the actual working state of the support was determined by the measured parameters of the support load and roof subsidence. The results showed that: roof control design of the immediate roof adopts the "given load" working method; according to different control requirements, the main roof adopts the "given deformation" or "limited deformation" working method. In the field, the roof subsidence is less than the limit subsidence, the working state of the support is in the "limited deformation"; otherwise, the support is in the "given deformation" working state. In the field, support load is greater than that of the lower limit to the rock beam position, the support is in the "limited deformation"; otherwise, the support is in the "given deformation" working state.