A serires of soil bacteria and their biochemical characteristics was studied on coal gangue hills by reclamation measurements.The results show that:all bacteria population and biochemical activity,genus of actinomyces and fungi,and soil nutrients on covered area with soil were better than those on coal gangue hills without soil cover.Above indexes on legume areas were better than those of grass family areas with the same soil cover.But a variety of thick soil layers from 10 to 20 cm did not show significant...