Abstract: Backfill mining is an method that control the ground pressure and constrain the surrounding rock mass deformation. With thecontinuous development of mining, the backfill volum growth is rapid. The stress distribution of backfill is sectionalized. The study is aim to analyse the large backfill located in the No.2 mine area of Jinchuan Nickel Mine. It is large span and large volum. Monitoring data could indicate the feature of subarea distribution of backfill stress. Then the numerical simulation model is studied the principal stress of represented area nodes and drea the Mohr's circle. The characters of fracture are anticipated. The study could provide some suggestion for the following mining engineering and support measure.