The results of this study which had been investigated to analyse heavy metal levels and to compare lead, cadmium, copper and zinc concentration in urine of children who lived around the industrial area and the agricultural area. Samples were collected and analyzed from September to December 1986 from 7-9 years old children living in Seoul (4 7 cases), lri ( 64 cases) industrial area and Chinan (56 cases) agricultural area. The summarized results were as follows: 1) The concentrations of lead were Seoul 28.7 $pm$17.7 ug/l, lri 25.3 $pm$7.5 ug/l and Chinan 19.3 $pm$5.2 ug/l 2) The concentrations of cadmium were Seoul 1.5 $pm$0.8 ug/l, Iri 1.4 $pm$0.5 ug/l and chinan 0.9 $pm$0.3 ug/l 3) The concentrations of copper were Seoul 12.8 $pm$7.0 ug/l, Iri 10.5 $pm$8.4 ug/l and Chinan 10.0 $pm$4.5 ug/l 4) The concentrations of zinc were Seoul 383 $pm$279 ug/l, Iri 329 $pm$133 ug/l and Chinan 267 $pm$181 ug/l 5) In lead, cadmium and zinc concentration of children, there were statistical difference between the industrial area and the agricultural area 6) There were no indicated significantly levels by the Sex