The main role of map is confined to representation of various kinds of decision schemata and appraisal results. But it almost does no good to the understanding and definition of problems. The concept map is a new method that can support the knowledge derivation and knowledge sharing. Through the concept map method the new knowledge can be effectively obtained. The experiential knowledge of different user and expert can be organized through the concept entity and concept relation and represented visually as map

thus support the geo-model construction. The Geo-model construction process based on concept map has 5 steps: Geo-model description

Geo-model definition

model construction

transformation from Geo-model to computational model

and CASE generation. Then we discuss in detail the characteristic of the model supporting system and the visual model construction environment. Finally the background data

such as the water engineering distribution and spatial data

of the Yongdinghe Watershed is used to support the construction of Concept Map model of the Xiaoqinghe floodplain

on which the flood simulation model of the Yongdinghe River and the Xiaoqinghe floodplain is constructed. The flood simulation result is overlaid with social and economic data to evaluate the flood disaster loss and the results is satisfactory and encouraging.