A Study on environmental Investigation in Imha Dam for the finding the degree of water quality and heavy metals was carried out at 4 sampling station during the period from August 15, 1993 to May 7, 1994. The results were as follows. 1. The ranges of values of pH for water were st. 1-7.56, st.2-7.77, st.3-7.9, st.4-7,7 on the average. Total average of pH values were 7.56-7.9 2. The ranges of values of DO for water were st.1-8.71($mg/{ell}$), st.2-8.64($mg/{ell}$), st.3-10. 25($mg/{ell}$), st.4-9.01($mg/{ell}$) on the average. Total average of DO of values were 8.64-10.25($mg/{ell}$). 3. The ranges of values of BOD for water were st.1-1.1($mg/{ell}$), st.2-1.0($mg/{ell}$), st.3-0 86($mg/{ell}$), st.4-0.99($mg/{ell}$) on the average. Total average of BOD of values were 0.86-1.1($mg/{ell}$). 4. The ranges of values of COD for water were st.1-1.12($mg/{ell}$), st.2-1.4($mg/{ell}$), st.3-0 98($mg/{ell}$), st.4-1.46($mg/{ell}$) on the average. Total average of COD of values were 0.98-1.46($mg/{ell}$). 5, The ranges of values of T- N for water were st.1-0.36($mg/{ell}$), st.2-0.49($mg/{ell}$), st.3-0 23($mg/{ell}$), st.4-0.83($mg/{ell}$) on the average. Total average of T-N of values were 0.23-0.83($mg/{ell}$). 6. The ranges of values of T-P for water were st.1-0.053($mg/{ell}$), st.2-0.06($mg/{ell}$), st.3-0.02($mg/{ell}$), st.4-0.07($mg/{ell}$) on the average. Total average of T-P of values were 0.02-0.07($mg/{ell}$). 7. In the E. soli group distribution were counted st.1-1130, st.2-1113, st.3-152.3, st.4-1253 by the MPN test. Total distribution of E. soil group were 152.3-1253. 8. The concentration of heavy metals of Cu, Mn, Pb, Zn were measured st.1-0.59, 0.18, 0 04, 74.6( ${mu}g/{ell}$), st.2-0.39,0.29,0.03, 54.3(${mu}g/{ell}$), st.3-0.1,0.3, ND, 8(${mu}g/{ell}$), st.4-0.96, 0 26,0.23,45.6(${mu}g/{ell}$) on the average. Cd, Hg, Cr were not detected in the sampling site.