Abstract: In order to accurately obtain filling mining surface deformation data，it is necessary to test the quality of monitoring data at each period.The results show that control points are stable during monitoring through F-test and t-test for the stability analysis of surface deformation monitoring data of filling in cold region.Then，further analysis indicates that there are three kinds of vertical movements：the first is the surface subsidence caused by mining；the second is roadbed subsidence under long-term car loads；the last one is thaw collapse of seasonal frozen soil.The last is more general in the high latitude regions of China，and this phenomenon will have some influence on the surface deformation monitoring data，which enlarges the surface movement boundary and reduces the main affecting tangent angle.It is not conducive for getting estimated parameter accurately for this kind of geological and mining conditions.

Key words: Backfill mining, Statistical tests, Stability analysis, Seasonal frozen soil