The research grasps water quality contamination source by investigating the data that are superordinate laws and the relatedplans implemented for establishing water quality improvement measures of upper stream for Chung-Ju Dam, presentconditions of the hydraulic and hydrology, the present conditions and plans of environment basic facilities, and presentconditions of main contamination source’s occurrence load and discharge load, etc. The research used the QUAL2Esimulation which is being widely applied to simulation of river water quality because the QUAL2E has high credibilityamong water quality simulations known throughout the country. On basis of this research, regulations and politic alternativesare required in order to water quality improvement upper stream for the Chung-ju dam, especially establishing processingfacilities in the region where loading amount is concentrated should be considered with the additional research regardingcost-efficient facility of pollution source.