[en] Fermi motion corrections for deep inelastic cross section on carbon nuclei at 300 GeV energy of primary muons have been calculated to obtaine qualitative estimates in HA-4 experiment kinematic region. The calculations have been performed in the nonrelativistic approach using incoherent approximation. The retios between structure functions of nucleus and free nucleons have been found at Q² > 10(GeV/c)². The calculations indicate that the Fermi motion produces the average shift of about 20 percent in kinematic variables x and νsub(μ) and corrections for the cross sections exceed 30 percent for the x > 0.7 region. Thus the interpretation of experimental data should include Fermi motion in nuclei