Earthwork　calculation　is　correlated　to　the　investment　of　land　consolidation.　Based　on　the　research　of　the　theory　of　Digital　Topographic　Model,　the　DTM　model　function　and　other　spacial　analysis　functions　under　MapGIS　are　studied　to　confirm　the　earthwork.　Xianglexiang　project　in　Pingyao　county　of　Shanxi　Province　was　taken　as　a　case　to　introduce　detailed　processes　of　earthwork　calculation.　Compared　with　traditional　method,　this　method　is　feasible　and　reliable.　©　2011　IEEE.