Spatial information encoding which presents the interface between the real and information entities

is one of the most important steps in designing GIS. Most GIS and mapping systems almost adopt the ways of encoding for geographical attributes

which are more effective for spatial analyses but weaker in mapping. Referring to the other coding methods such as AutoCad and MapCad

the authors raised the concepts of geographical entity encoding model（GEEM） and cartographic entity encoding model （CEEM）

and compared their advantages and disadvantages in mapping. A new model

coupled geographical-cartographic attributes encoding model （CGCEM）

has been proposed based on the two models mentioned above.