Titania was incorporated on activated carbon paper by reacting titanium butoxide with it. The oxidation state of titanium was +4 and its incorporated amount was 2.5 wt% as titania. The titania incorporation on the paper increased its electric field adsorption of NaCl by four times, resulting in a significant enhancement of its capacitive deionization performance. The feasibility of the titania-incorporated activated carbon paper as a capacitive deionization electrode was discussed based on its physical and electric field adsorptions of various electrolytes measured at different temperatures and electric potential differences.