The contradictions for sustainable development of Dalian gulf are dynamic. These contradictions involve spatial factors （e.g. the concentration distribution of pollutants and environmental function division

etc.）. In order to deal with and simulate contradictory mechanisms of various developing plans （various economic increase plans and urbanization plans） of the area along Dalian gulf

this paper puts forward a new conceptual GIS

S

D frame in order to simulate the water pollution

c

ontrolling system of Dalian gulf. The model of the system is built. The water pollution of Dalian gulf is modeled temporally and spatially

and regulating strategies are worked out. This paper simulates the impacts on environmental quality of Dalian gulf by various development plans of the area. The combination of SD （Dynamic Modelling） and GIS （Spatial Modelling） are mutually complementary. This may describe

analyze and stimulate a complex system （e.g. complex structure

timely dynamics

and spatial factors

etc.）

and contribute to solve complex system problems. This helps decision

m

aker consider dynamic contradictions of environment and development in two dimensions.