We report the synthesis of (Zn 2+ Ti 4+ ) substituted hexagonal ferrites, BaZn2(Zn0.5Ti0.5)xFe16-xO27 (W-type) and Ba2Zn2(Zn0.5Ti0.5)xFe12-xO22 (Y-type), and the relationship between their composition and magnetic properties. Substituted W-type ferrite was synthesized in the region of 0.0 ≤ x ≤ 1.5. A decrease in the Curie temperature of the W-type phase indicated that the exchange interactions between the Fe 3+ ions weakened due to the substitution of Zn 2+ and Ti 4+ ions. Spontaneous magnetization (σS) at x = 0.5 was similar to that at x = 0.0. This reflects the equal distribution of nonmagnetic Zn 2+ and Ti 4+ ions to spin down sites and spin up sites, respectively. At x > 0.5, σS decreased clearly, which was possibly caused by a deviation from the collinear arrangement. Substituted Y-type ferrite was also obtained up to x = 0.5. The Y-type phase is more unstable than the W-type phase with respect to this substitution rate.