Abstract: Using coal gangue as the backfill material of building foundation is an effective way of comprehensive treatment of mining area，which not only reduces the environmental pollution of coal gangue but also reduced the foundation construction cost.Components，physical properties，mechanical properties and engineer properties of coal gangue were studied and analyzed by using the methods of laboratory tests and the project.A set of integrated reclamation system was primarily built，including feasibility analysis，reclamation site selection，reclamation site planning，backfilling elevation and soil thickness determination，backfill foundation treatment，reclamation partition and construction，and bearing capacity detection of the foundation.The results showed that to avoid the two-stage deformation influence on foundation stability，a stabilized region should be selected.The partition construction in the project area is adopted to improve the utilization rate of coal gangues.During the process of the foundation treatment，the methods of stratified backfill and multiple vibration treatments are used so that the bearing capacity of coal gangue foundation is far greater than the natural foundation after treatment by vibration and compaction.It is fully able to meet the need of construction project.

Key words: Subsidence region of coal mined, Coal gangue, Foundation treatment, Construction technology, Bearing capacity test