Abstract: Along with the devopment of the coal,the issueel of coal mining under buildings, railways and water is becoming serious. How to make mining the coal more effective and reasonable under buildings railways and water has become an important research topic of the coal industry. According to the requirements of the development of green mining, coal gangue paste packing method was put forward by packing legacy strip pillar which are under the buildings. Big step from all the isolation filling method was used along the working face,when working face impelling 4~5 m. by theoretically analyzing,the filling system capacity is 150 m³/h.Combined with rock shift observation, the surface subsidence maximum is 58.2 mm, surface subsidence coefficient is 0.08~0.10.