Abstract: Coal gangue is a kind of artificial pile and regional landform is complex,so the traditional mapping methods are difficult to be implemented.In this paper,using RTK combined with total station,mapping practice was actualized on Longquan coal gangue dump in Mentougou District,with the conditions of steep slope and loose gangue,and the precision analysis and mapping effect comparison was in progress.The result show that the method is suitable for the coal gangue dump mapping and can fast data collection,precision satisfies work requirements,the topographic map can better restore the actual terrain of coal gangue hill.