s:Electrolyzing charging method with H pattern double-side electro bath and X-ray diffraction are used to charge Titanium samples and to research cathodic charging hydrogen process of Ti in seawater. At the same time, the effects of thickness of Ti samples, cathodic charging current density and anodic potential on the H permeation process are studied.The result indicates that the surface film of Ti is the main factor controlling the process of hydrogen permeation.Following the thickening of Ti samples voltic peak value and time for voltaic peak value are increased.With cathodic current density and potential of side B raising,voltaic peak value is increased,and time for voltaic peak value is reduced.