Abstract: In order to solving the problems of complex geological conditions and large amount of surface structures(plants，residential and drainage pump station)，which around roadway protective coal pillar underground in Hanwang coal mine，roadway backfill mining method was put forward，and then mining width of working face was confirmed by composite beams and elasticity mechanics，surface movement deformation forecast parameters was obtained according surface observation data analysis，and surface structures movement deformation values was obtained by calculation，then the controlling results of backfill mining to surface subsidence could be reflected by surface reduction subsidence coefficient was put forward at the end，the studying results showed that the problem of coal under surface structures could be solved better by roadway backfill mining method applied in roadway protective coal pillar，and safety width of working face was 4m under roadway backfill mining method，the protective pillar mining could be predicted by strata movement parameters by fitting，the damage grade was I of plants above the working face，and structures around residential areas was undamaged，the reasons of the worst results of reduction subsidence were analyzed，then relevant promote method was put forward.