Spatial　layout　widely　exists　in　many　real-world　domains.　To　solve　the　problems　of　scene　and　layout　in　the　cartoon　making　process,　we　developed　a　Seed-Matrix　3D　Scene-Layout　System.　Being　composed　of　layout　planning　and　scene　structure,　the　system　achieved　the　auto-building　of　the　scene　by　random　seeding　and　dividing　algorithm　based　on　the　characteristic　and　proportion　of　different　terrains,　and　computed　the　layout　positions　of　objects　by　describing　the　layout　constrains　as　weighted　matrix.　The　system　runs　well　and　efficiently　in　practice.