The study aimed at observing the delivery characteristics of pollutant loadings by calculating the delivery rate of drainage areas on the pollutant item in the basin of Soyangho that is the biggest multipurpose dam in the upper region of the Bukhan River. According to the result of the observation on the delivery characteristics of pollutant loadings depending on the flow regime change, the delivery rate increases in BOD, SS and T-P. In case of T-N, the delivery rate increases in Naerincheon,

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... kcheon and around Hapgang city where there are many point pollutant sources. The delivery rate generally increases during the period of ninety-five day flow and high water flow. In case of Soyangho, the delivery curve shows a gentle slope when lower ninety-five day flow compare to tributary channels, which indicated the continuous discharge of pollutants during the period of base flow. In addition, the delivery rate duration curve depending on the amount of discharge was recorded, which can be utilized to establish TMDL management's objective of water quality and to decide.