Plasma electrolytic oxidation (PEO) is one of the promising methods for creating wear resistance coatings on aluminum alloy. The qualities of PEO coatings are determined by many factors, such as substrate materials, power supply modes, electrolyte composition, oxidation time and additives. In the bipolar power supply mode, the cathodic current density plays an important role in the PEO process. Previous results showed that the increase of cathodic current density could reduce the strong plasma discharges which made the coatings more compact and have better wear resistance. The composition of electrolyte is another key factor affecting the structure and performance of PEO coating. The use of Na2WO4 containing electrolytes has emerged in recent years due to the wear and corrosion resistant properties of the resulted coatings. However, there is no research on the effect of cathodic current density on the structure and wear resistance of PEO film prepared in Na2WO4 containing electrolyte. In this work, PEO films were prepared on 6061 aluminum alloy under different cathodic current densities in electrolyte composed of Na2SiO3, Na2WO4 and KOH. The effect of cathodic current density on the thickness, composition, structure and wear resistance of the PEO films was studied.