  We discuss the flavor structure in a resolutions of magnetized
$T^2/\mathbb{Z}_2$ orbifold models. The flavor structure of Yukawa couplings
among chiral zero-modes is sensitive to radii of the resolved fixed points of
$T^2/\mathbb{Z}_2$ orbifold. We show in concrete models that the realistic mass
hierarchy and mixing angles of the quark sector can be realized at certain
values of blow-up radii, where the number of parameters in the blow-up model
can be smaller than toroidal orbifold one.
