community structure and diversity of soil macro-fauna under six types of land use / cover was studied in Horqin Sand Land to understand effects of changes in land use / cover on soil macro-fauna in north agro-pastoral ecotone, the results showed that 1) the richness, density and diversity of soil macro-fauna was the highest in natural grassland, second was in fixed sand-land and plantation. Though the richness, density and diversity of soil macro-fauna was lower in dry and irrigation farmlands, they was significant higher than that in moving sand-land.; 2) dominant group was Anthicidae in natural grassland, fixed sand-land, plantation and irrigation farmland, was Tenebrionidae in dry farmland, and dominant group was not signification in moving sand land; 3) species similarity was the highest among natural grassland, fixed sand-land and plantation, species similarity was the lowest between moving sand-land and other five types of land use/covers, and was in the middle in farmlands; 4) the diversity and density of soil macro-fauna was increased significantly after moving sand-land turn to fixed sand-land or dry farmland turn to irrigation farmland, the diversity and density of soil macro-fauna was decreased significantly after natural grassland was reclaimed to farmland or fixed sand-land was turned to plantation; 5) the proportion of phytophagous and omnivorous fauna in the community increased after moving sand-land turned to fixed sand-land, the position of predatism fauna in the community increased after dry farmland turned to irrigation farmland.