The research of  Xiegou Mine of Shanxi Xishan Jinxing Energy Corporation for oblique groove 18503 fully mechanized coal working face along the lane beside the filling strength and stay within the lane support strength design was studied, in combination with numerical simulation, the lane branch into the optimal support mode within the left lane was determined. At the same time, the scene of the left lane for the mine pressure observation, analysis and research for big mining height broken mining section along the characteristics of mine pressure appearance were made, the big cross section along the comprehensive evaluation of the effect for the fully mechanized coal face optimized the construction process and supporting parameters. The technology provided theoretical basis and practical experience for large broken mining height and the big cross section along the technology for the fully mechanized coal face.