Heavy metals are the major components in the composition of aquatic environment and living animals, but when the range of these metals change, severe increase or decrease, it can be harmful. In this study, the amount of six heavy metals was measured by cation exchange resin (chelex-100) in 1994-1995. The annual average of the heavy metals was : Fe (113.82), Cd (3.25), Pb (26.34), Ni ( 17.96), cu (21.95) and Zn (83.9) µg/lit In Compare with standard value, it shows that, amount of Cu and P b in all season and Cd, Zn, Ni in spring and summer are in critical range. There is a significant correlation between concentration of heavy metals and physico-chemical factors such as temperature, pH and salinity.