Abstract：Based on the technique of in-situ gob-side entry retaining with entry-in packing in fully-mechanized top-coal caving mining face(GEREPTF)，the mechanical model of the surrounding rock for GEREPTF is established according to the key strata theories. Based on these theories，the reasonable calculation formulas of the packing body supporting resistance are presented. According to the different field conditions，the interaction relationship between the packing body and the surrounding rock is also studied. The results show that the surrounding rock stability is closely related with the packing body and the entry support method. The adoption of bolting with bar，wire meshes and cable support techniques in the entry combined with the technical measures of timely packing and strengthening temporary support can guarantee the integrity of the entry. Thus the packing body and the surrounding rock can formulate a good and corporate carrying capacity system. It can improve the bearing capacity of the surrounding rock；so the necessary packing body supporting resistance can be greatly reduced. The successful field industrial test proves that the GEREPTF technique and its corresponding mechanical model and calculation formulas of the packing body supporting resistance can be adopted for the convenience and rationality，which can be employed for similar fully-mechanized top-coal caving mining face.
