A preliminary theory of the mechano-catalytic water-splitting proposed in 1998. The friction between the stirring rod and the glass surface generates an enough electriostatic field for the field-emission of positive holes from the semiconductors. The emitted holes react with water molecules to evolve oxygen molecules and protons, which go to the glass surface and combine with the electrons there to evolve hydrogen molecule. However, it leaves behind to clarify the role of the electrodes.