Abstract: 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.