Titanium and its alloys are highly susceptible to surface oxidation during laser processing. To address this issue, a cathodic electric protection laser processing technique based on an inert electrolyte is proposed. Further, to investigate the effectiveness of this technique, the microscopic morphology and the O content of laser processed area were characterized using SEM and EDS under different operating currents and electrolytes. The results prove that the O content of the laser processed area can be reduced by applying the following two approaches: current competition and the enhancement of the electrolyte's inertness. For an electrolyte obtained by dissolving 0.2 mol/L KNaC₄H₄O₆ (potassium sodium tartrate) in 40%EtOH and at an operating current of 600 mA, the processed area exhibited minimal defects, such as cracks and porosity, and the O content was reduced to 4.9%. A voltmeter and a reference electrode were used to determine the working circuit volt-ampere characteristic curve and the cathodic polarization curve. The results revealed that the curves exhibit an evident linear relationship within the operating current range of 150~900 mA. Further analysis supports the relationship between the electrolyte inertness and the O content: enhancing the electrolyte's inertness reduces the supply of H₂O in the processing area, thereby preventing the reaction between H₂O and Ti through the method of reducing reactants. Consequently, the O content is reduced.