The　microwave　and　centrifuge　technologies　were　combined　to　release　bound　water　and　improve　dewatering　capability,　which　was　carried　out　by　measuring　the　Capillary　Suction　Time　(CST),　rheological　parameters　and　water　content,　collecting　sludge　images　to　extract　morphological　features　and　analyze　fractal　dimension.　The　experimental　results　indicated　that　water　content　decreased　with　an　appropriate　increase　of　centrifugal　speed　and　temperature.　When　microwave　power　was　1000　W,　microwave　temperature　was　50°C,　centrifugal　speed　was　2000　r/min　and　centrifugal　time　was　15　min,　the　water　content　of　sludge　reached　the　lowest　value　of　83.75%.　The　fractal　dimension　of　sludge　was　in　the　range　of　2.4-2.8　after　the　pretreatment　of　microwave.　A　model　of　dewatering　characteristics　was　established　by　fitting　dewatering　capability　parameters　and　water　content,　which　would　contribute　to　predicting　and　improving　dewatering　capability　of　sludge.