Abstract: In view of the severe ground pressure in the traditional wall-built gob-side entry retaining, such as obvious roof subsidence, floor heave, extrusion of two sides and wall damage, and the high repair rate seriously affects the normal use of the roadway, this paper studies the large deformation control technology of floor heave under the condition of block filling gob-side entry retaining by theoretical analysis, numerical simulation and ground pressure monitoring. A comprehensive control system for large deformation of floor heave is put forward, which includes "roof presplitting blasting pressure relief technology"+"strengthening support technology for key parts of roof"+"flexible yielding support technology above block"+"double control bolt support technology for block wall". Through the implementation of the above technology, the stress transmission of roof is cut off, the pressure of roof is reduced, the stress condition of surrounding rock is improved, the stability of roadway roof and wall is improved, and yielding support is realized. The field monitoring shows that the stress value of anchor cable and deformation of floor heave are reduced by 34% and 77% respectively, and the height and width of roadway meet the requirements of safe production. The research results have certain reference significance for controlling large deformation of floor heave in block filling roadway under other similar geological conditions.