In the analysis of archaeological copper objects by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP), the overlapping of spectral lines from different elements concerned would result in erroneous measurements, particularly for trace constituents. Therefore, it is quite important to examine the spectral profiles of main elements with the spectrometer used and to select a best line for each element. In this report, the effects of major constituents of bronze (copper, iron, lead, tin, and zinc) on minor elements (antimony, arsenic, cobalt, manganese, nickel, and silver) as well as on major elements were examined with a Seiko, Model SPS1100, ICP apparatus. An analysis line free from interference or susceptible to background correction in the determination of bronze composition is recommended for each element concerned.