  We suggest simple models which produce the suitable fermion mass hierarchies
and flavor mixing angles based on the supersymmetric SO(10) grand unified
theory in 6 dimensions compactified on a T^2/Z_2 orbifold. The gauge and Higgs
fields propagate in 6 dimensions while ordinal chiral matter fields are
localized in 4 dimensions. We introduce extra vector-like heavy fields in the
extra dimensions. We show three models according to the configurations of
vector-like fields in extra dimensions. The suitable fermion mass hierarchies
and flavor mixings are generated by integrating out these vector-like heavy
fields.
