Abstract: Aiming at the serious water pollution accidents happened in China,combined with pre-established 1D system dynamics water quality models and integration of GIS with system dynamics(SD),a realspace system of spatial-temporal simulation and dynamic regulation of water quality in water pollution accidents is developed;The Songhua River water pollution accident which happened on November,2005 was taken as example to make validation of simulation results and visual dynamic regulation.Dynamic simulation and trend forecast of pollutants transport and transformation is made in spatial and temporal dimension.The simulation,forecast of water quality and model regulation based on different emergency response strategies in water pollution accident is realized.