The degree of unsaturation of several ions (include unstable complex) of trace metals in sea water and its control factor are studied. It is concluded that the ions are unsaturated in sea water and are at thermodynamic unstable state (nonequilibrium concentration and nonequilibrium state). The control factor is that the continent (natural processes) not to supply the sea water with sufficient ion content (no suspended matter) which reach the saturation. Chemical, biological and physical processes affect the ion content wíth a degree.