Abstract：In order to control the stability of surrounding rock mass and the capability of top-coal for overlength isolated fully-mechanized top coal caving face，the distribution characters of abutment pressure for the working face are analyzed contrastingly with finite element software. The stress field variation law for overlying main roof is studied. The front abutment pressure distribution law of FLAC3D working face for coal seam during initial and normal mining stages are analyzed. Two peak value areas exist of working face front abutment pressure，and one peak value area of rear abutment pressure exists in the middle section along working face. A low abutment pressure area exists among the two front abutment pressure peak value areas and gob peak value area in the main roof. The peak value area of gob abutment pressure will evolve into three peak value areas in the location away from wall. The abutment pressure peak value of top coal is bigger than that of the coal mined with cutter，but the influencing scope of abutment pressure of top coal is less than that of the coal mined with cutter，and the limit equilibrium section width of top coal is also bigger than that of the coal mined with cutter. The limit equilibrium section width of abutment pressure at beginning of mining is bigger than that during normal mining. When the width of isolated working face is lengthened，the peak value coefficient of abutment pressure increases at initial mining period，but reduces during the course of normal mining. Overlength isolated working face reduces the superposed influence of two sides abutment pressure on isolated working face.
