The　technological　conditions　for　preparation　of　red　mud-coal　gangue　lightweight　pottery　sand　were　studied.　The　formulation　of　the　lightweight　pottery　sand　was　determined　by　comparing　the　sintering　images.　The　results　indicated　that　as　to　the　mixture　of　red　mud　and　coal　gangue,　the　expansion　temperature　of　mixture　decreased　with　the　increasing　of　the　content　of　red　mud.　The　composition　of　30%　red　mud　and　70%　coal　gangue　was　determined　to　have　the　best　expanding　performance　in　this　study　and　selected.　The　optimal　technological　conditions　of　lightweight　pottery　sand　was　systematically　studied　through　orthogonal　experiment　method　and　accordingly　the　lightweight　pottery　sand　with　bulk　density　of　617.89kg/m(3),　water　absorption　of　0.14%,　the　single　particle　compressive　strength　of　2.95MPa,　the　softening　coefficient　of　0.98　was　successfully　prepared　using　the　selected　composition　after　preheated　at　550　degrees　C　for　20　min　and　then　sintered　at　1300　degrees　C　for　20min.