Based on overall analysis of water pollution control system in Luoyang city, this thesis, by means of the system analysis, tries to establish a multiple model including both System Dynamics (SD) model of discharge sewage control system in this city and dynamic water quality model of Luo River in an attempt to show comprehensively the dynamic change trend of urban water pollution control system. This method, applying System Dynamics to urban water pollution control system and combining it with river water quality model, is a new attempt. The prominent advantages are: first, a model of study of dynamic problem is provided for urban water pollution control system; second, SD model of discharge sewage control system has built a laboratory of strategy and policy for policy-makers.