Abstract: In order to study surface deformation law of thick coal seam mining when the mining depth and mining height was variable,double factors of mining depth,mining thickness and small buried depth,thickness of No.11401 to No.21601(up)two working face on the surface movement deformation field measurement were analyzed in Huangyuchuan Mine .The results showed that No.21601(up)working face on the earth’s surface deformation degree was greater than No.11401 working face.After two faces full mining surface subsidence value was approximately equal than the reciprocal of the ratio of the two working faces base mining.The same geological conditions the mining ratio concept could be used to measure surface deformation damage evaluation of thick coal seam mining,the base was small surface deformation damage seriously.When the mining ratio increased,the surface deformation accordingly reduced.The end use of indoor physical simulation experiment to simulate the same deep effect of surface deformation rule of thick coal seam mining,the reasonahility of conclusion was verified,the prediction of thick coal seam mining ground surface deformation and evaluation provided the reference.