Lithium deintercalation process of lithium ruthenium oxide, Li2RuO3, was characterized by X-ray diffraction and electrochemical measurements. The deintercalation proceeded from x = 0.0 to 1.3 with two-phasic reactions for 0 < x less than or equal to 0.5 and 0.7 less than or equal to x less than or equal to 1.0. Monophasic properties were observed for the compositions, Li1.4RuO3 and Li0.9RuO3; Li1.4RuO3 has a monoclinic cell isostructural to Li2RuO3, and Li0.9RuO3 has rhombohedral symmetry with the ilmenite-related structure. The lithium deintercalation from the lithium layer caused the rearrangement of the oxide-ion array from a cubic close packed (ccp) to a hexagonal close packed (hcp) structure. Further, electrical and magnetic properties were discussed on the basis of electrical and magnetic measurements.