The electrochemical reduction of the bismuth ions has been investigated in the tartaric electrolyte. Kinetics and mechanism of the process and the effect of various factors on the electroreduction process of the bismuth ions have been studied according to cyclic and liner polarization curves drawn on the Pt electrodes.  According to data, the value of effective activation energy has been calculated. The results of the calculation indicate that the electrochemical reduction process of the bismuth ions is accompanied by electrochemical polarization.