The researches of the ultra violet ray curable aqueous ink jet ink were carried out. Several advantages in adopting the UV system were ascertained by preparing novel materials, which were compatible with ordinary form of aqueous ink jet inks. The aqueous photo initiators and anionic, nonionic, and cationic UV resins were synthesized. The sensitivity in photo polymerization, water fastness of dye base inks on plain paper, fading of dyes by UV exposure, reduction of intercolor bleed by anionic ink and cationic pigment, adhesive force, transparency, and color reproduction in pigmented inks were exemplified with experimental results. All experiments were carried out by using bubble jet color printer loaded low pressure mercury lamps. The aqueous UV inks operated stably on these existing equipments. The main object of loading UV system is to improve the weak points in aqueous pigmented inks. UV system results successfully in the improvements of it. The first key factor to come up the next step is to increase the light sensitivity in colored inks. The performance and future subjects of this technology are discussed.