Abstract: With the surface subsidence areas of a mine as engineering background，and based on particle flow method and PFC^2D，numerical simulations on a variety of backfill schemes in surface subsidence areas are carried out.The migration rule of backfill disposal paste under different kinds of backfill schemes was obtained，which can optimize and select backfill technology effectively.The results are shown as follows：in the process of mining under subsidence areas，the subsidence of backfill disposal paste in fully cemented backfill scheme is minimum，which shows the best subsidence control effect.Stratified backfill scheme takes second and completely non-cemented backfill scheme is the worst;Using the paste backfill in surface subsidence can form stress arch in disposal paste and the surrounding rock mass which can pass stress and has a good control effect on the stability of the surface subsidence; Separation factor in completely non-cemented backfill scheme is minimum，0.12%，which makes the best contact efficiency between disposal paste and bottom of the pit.The separation factor is maximum，0.18% in fully cemented backfill scheme，showing the worst contact efficiency.The rest schemes have similar separation factors，0.15%，0.16% and 0.148%，and its contact efficiency is located between the former two respectively.

Key words: Surface subsidence areas, Backfill technology, PFC2D, Numerical simulation, Paste