  The analysis on nucleon structure functions at small Bjorken $x$ in the
framework of holographic QCD is presented. In the model setup, the complicated
nonperturbative interaction between the virtual photon and the target nucleon
is described via the Pomeron exchange, which corresponds to the reggeized
graviton exchange in the AdS space. We show that our calculations for both
$F_2$ and $F_L$ structure functions are in agreement with the experimental data
measured at HERA.
