This study has been carried out to clarify the characteristics of discharge and pollutant loading according to flow conditions at jiseok stream watershed (JSW). A flow rate and pollutant load in the study watershed were estimated by equation of stage-discharge and discharge-loads rating curve. By using the methods above, I''ve evaluated the water quality (WQ) of the JSW if it is satisfied with the standard target. I''ve collected the data of BOD and T-P from the JSW every 8 days for the duration of 12 months. And then, I''ve schematized the data upon the load duration curve and the results showed me that the WQ of JSW was satisfied with the standard target. I''ve also collected the same data every each day for the duration of 12 months from JSW and have schematized the data again. And the results showed that it also was satisfied with the standard target. To be concluded, I''ve determined that point pollution sources of JSW gives more significant impacts to the WQ than non-point pollution sources of JSW and hence, as time goes, point pollution sources will keep depriciating the WQ of JSW. Therefore, further efforts will be required to JSW to maintain the WQ.