Abstract: For the characteristics of large dip angle and thick coal seam at 37220 longwall fully mechanized caving face in Dongxia Coal Mine of Huating Coal Industry Group, through the analysis of the different conditions of hydraulic support in face, the results indicated that the main reason leading to the instability of supports are the impact of falling rock, face inclination, instability of adjacent supports, empty roof over the support and so on. We summarized the specific measures of supports state control from advancing supports operation and rehabilitation technology. These measures are effective in controlling supports and achieve the safety production of large dip angle and thick coal seam at inclined layered longwall face.