Abstract: It is the centre of electrode kinetics that mechanisms of electron transfer through the interface between metal electrode and electrolyte. According to the classical theory of electrochemistry, the electrode process is one that the electron pass over the potential energy barrier of interface to bond with activate ion. However, quantum electrochemistry recognizes also that the electron may tunneles the energy barrier. If we can know the height and width of the barrier when the electrode process occurs, then, in principle we can determine the way of electron transfer, in terms of the calculation method of Schottky emission and "cold emission". However,the height and width of the barrier cannot be measured experimentally as yet, therefore, it is significant to research in to the energy barrier in theory.