In　this　study,　Discontinuous　Deformation　Analysis　(DDA)　method　is　extended　to　simulate　Soil-Water　Characteristic　Curve　(SWCC)　by　considering　both　capillary　water　and　bound　water　at　the　micro-scale.　First,　a　simple　and　practical　bound　water　model　is　proposed　and　incorporated　into　DDA　program　to　simulate　SWCC　in　the　high　suction　range.　Then,　to　prove　the　availability　of　the　developed　program,　the　extended　DDA　is　used　to　simulate　the　SWCCs　of　two　types　of　fine　sand　with　kaolin　clay　in　a　wide　suction　range.　The　simulation　results　agree　with　the　experimental　results,　which　demonstrate　that　the　extended　DDA　is　an　alternative　method　for　simulating　and　analyzing　SWCC　of　both　cohesionless　soil　and　cohesive　soil.　Finally,　one　of　the　influential　factors　specific　surface　area　is　theoretically　analyzed.　This　study　provides　an　approach　to　simulate　the　matric　suction　of　unsaturated　soil,　and　the　extended　DDA　could　be　a　potential　tool　for　unsaturated　soil　research.