The content of physicochemical components were investigated in surface water, bottom water and mud, and samples of thorse which were collected from 15 sites among 6 areas in the lower part of Han River. The estimated values of the water in this areas were compared statistically with each other. The values of K, Na, Cl and conductivity in water were strongly correlated with each others and also among the values of Fe, Mn and Cu in mud. On the coat rary, the value of dissolved oxygen (DO) was reciprocally correlated with total alkalinity, The concentration of heavy metals decrease in the order of Fe, Mn, Cu and Cd in this water and mud. In comparison with the content of heavy metal in each water areas, it were decrease in the order of An Yang stream, near the Seong San big bridge, near the Haeng Ju Oe Ri, near the Haeng Ju Nae Ri and Chang Neung Stream. Ingenerally, the contents of heavy metals in the mud was found higher than in water because the heavy metals was precipitated on the mud due to the oxidation and the others in water. The physicochemical components in this Han River area was influenced mainly from the waste water and mud of several tributaries. however, it indicates that the water quality of this Han River area was ever suitable for agriculture`s purpose. Especially the quality of water and mude in An Yang stream was severely polluted owing to the influence of waste water from the town of Young Deung Po, and also in 15 site i.l. Chang Neung stream was severely polluted due to a mixture of foul water and wastewater.