Temperature dependences of the e(aq)(-) spectrum and G epsilon(max) were investigated by the pulse radiolysis method over a temperature range of 25-400 degrees C including the supercritical condition and the e(aq)(-) formation in supercritical water (D2O) was confirmed. With increasing temperature, the absorption peak (lambda(max)) of e(aq)(-) shifts significantly to longer wavelength. The value of G epsilon(max) in supercritical water is considerably smaller than in liquid water at room temperature. The behavior of e, revealed here is helpful for an extensive understanding of water radiolysis and for the study of e(aq)(-) involving radical reactions in supercritical water.