Abstract: A case study of land reclamation from Xinzhuangzi coal mine is used to analyze the probability of heavy metal's pollution when coal gangue is used to fill the subsidence area.After reclamation,the floor space of coal gangue dump will be reduced,and subsidence area is reclaimed as cropland.At the same time,coal gangue is buried in the underground,which can play a role in controlling and preventing environmental pollution.It will obtain economic,social and ecological benefits.The model for reclamation in the subsidence area in Xinzhuangzi coal mine sets a good example for other mine areas in Huainan mining area.