Abstract: In order to study the reclamation effect of coal gangue filling and reclamation land in abandoned mining area,the reclamation land of Datong abandoned mining area in Huainan City was selected as the test area,and the soil physical and chemical characteristics of the reclaimed land and the surrounding unconventional land in Datong mining area were studied.The contents of total chlorophyll,soluble protein,proline and catalase in leaves of four kinds of seedlings including erigeron annus,humulus,tribulus terrestris and abutilon were studied,and the growth status of each plant was comprehensively and quantitatively analyzed by principal component analysis (MA).The results showed that soil bulk density,water content,trace and medium elements were different in the reclaimed land and non-subsided areas of Datong mining area,and the soil organic matter in Datong reclamation area and non-subsidence land were all at level 6.The available nitrogen and available phosphorus in Datong reclamation area was at level 6,and the available nitrogen content was at level 5;The available nitrogen content in non-subside area was at level 5,and the available phosphorus and available potassium were at level 4;The growth condition of humulus,tribulus terrestris and abutilon in the non-subsided area is better than that of the reclaimed area,while the growth position of erigeron annus in the non-subsided area is lower than that in the reclaimed area.

Key words: Coal gangue filling reclamation, Soil physical and chemical characteristics, Physiological index, Principal component analysis