Several ions (include unstable complex) of trace metals (Zn, Pb, Cu, Cd, Sn, and Bi) have been determined by single cell differential inverse polarography in China coatal waters. The :results indicate that the concentrations of these ions are relatively uniformly distributed in China coastal waters. The variable range is 士20-30% 'Of middle value and no tendency is presented. The concentrations in the river waters are same in the coastal waters.