  Q**2 dependence of nuclear structure functions is important for understanding
perturbative QCD in nuclear environment. However, current experimental data are
not sufficient for studying nuclear dependence in the Q**2 evolution because
the data are limited in the small Q**2 region at small x. The future HERA
program can study the evolution in the large Q**2 region, and it provides us
crucial information on recombination effects and on higher-order alpha_s
effects in the nuclear structure functions.
