Abstract: In view of the actual situation of multi-coal seam strip mining in China，the concept of coal dislocation coefficient is put forward.Based on the FLAC3D numerical simulation software，the influencing laws of different coal dislocation coefficients on the stress of upper and lower bands protection coal pillar，the stress of intermediate rock and surface movement deformation in multi-coal seam strip mining were studied systematically.The reason for the influencing law is analyzed，and the function relations were given.The calculating method of ultimate coal dislocation coefficient in multi-coal seam strip mining was pointed out.The research results have important theoretical and practical significance for the coal face design of multi-coal seam strip mining.

Key words: FLAC3D, Numerical simulation, Multi-coal seam strip mining, Coal dislocation coefficient