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This research introduces a efficient linear encoding appliced for plan image,and presents the spatial volumetric model construction according to multi-layer plane image. Spatial volumetric model representation had been used in computer vision 、CAD/CAM、robot motion simulation、pattern recognition etc. However, the more exact model representation we need, the more data information will be handled. The more load for data store and transfer can be expected. The use of hierarchical data structure presentation of quadtree and octree can attain to the compression of data and acceleration operation, and also can imediacy boolean and geometric proceed operation.Tradtion quadtree and octree tend to link nodes by pointers. Because of loss store space by a great lot of pointers, this research uses a new structure-linear quadtree and linaer octree. It stores hierarchial data structure in linear array, and it doesn`t need pointers to express relevant location. It need less than using pointers and also can operate basic geometric operation, such as boolean operation、rotation operation etc.
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