Abstract: In this paper, it took the mining technology reform of thinner middle thick coal seam in Ⅳ4111 working face of Yuanzhuang Coal Mine as the study background, then it used the method of combination of theoretical analysis and field measurement to study the "three machines" supporting technology of mechanized mining process in the working face. It obtained the optimal solution of "three machines" supporting for fully mechanized mining face, thus realized the target of high production and efficiency for coalface.