Abstract: Five new techniques in electrometric titration are described.They are:Ⅰ Oscillopolarographic titration at 1 micro and 1 macro Pt-electrodes.Ⅱ.Oscillopolarographic titration at 3 electrodes.Ⅲ.Oscillo-potentiometric titration at 3 electrodes.Ⅳ.Oscillo-potentiometric titration at 1 micro and 1 macro Pt-electrodes.V.A.C.Oscillo-potentiomctric titration at 2 macro Pt electrodes.The methods Ⅰ and Ⅱ use the abrupt change of oscillopolarogram to indicate end-point but do not require the oscillopolarograms to have a sensitive incision.The others do not use any oscillopolarogram but use the abrupt potential change between electrodes.Five new techniques in electrometric titration are described.They are:Ⅰ Oscillopolarographic titration at 1 micro and 1 macro Pt-electrodes.Ⅱ.Oscillopolarographic titration at 3 electrodes.Ⅲ.Oscillo-potentiometric titration at 3 electrodes.Ⅳ.Oscillo-potentiometric titration at 1 micro and 1 macro Pt-electrodes.V.A.C.Oscillo-potentiomctric titration at 2 macro Pt electrodes.The methods Ⅰ and Ⅱ use the abrupt change of oscillopolarogram to indicate end-point but do not require the oscillopolarograms to have a sensitive incision.The others do not use any oscillopolarogram but use the abrupt potential change between electrodes.