  We investigate the temperature and density dependence of the color flux tube
structure of dense two-color QCD with $N_f = 2$ Wilson fermions by using a
lattice simulation. From Refs. [1] and [2], we have already clarified the rich
phase structure in the low temperature region, including the hadronic and
superfluid phases. In this study we measure the quark-antiquark potential and
color flux tube profiles in such a low temperature region and find that even in
the high density superfluid phase, the color electric field is squeezed into a
flux tube as in the low density hadronic phase.
