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Based on the fundamental theory of spatial information multi-grid (SIMG), a four-layer model to construct a Self- adaptive Spatial Information Multi-grid (SSIMG) is put forward, which includes 4 layers, i.e. the basic grid layer, the multi-level subdivided grid layer, the visualization grid layer and the bottom cell grid layer. In the next part, the algorithm to construct Self-adaptive Spatial Information Multi-grid is discussed. The validity of SSIMG has been verified in case study at the last of this paper.