  Here we perform $ab-initio$ study of Curie temperature $T_C$ under
hydrostatic pressure for intermetallic compound GdFe$_2$. To calculate $T_C$
for GdFe$_2$ we applied mean-field solution of the Heisenberg model for several
magnetic sublattices with DFT/LDA calculated values of necessary exchange
interaction integrals and local magnetic moments. To compare with available
experimental data pressure values were taken from zero up to about 70 Kbar. It
corresponds to 2\% compression of the volume of the unit cell. In agreement
with experimental data $T_C$ grows under pressure. It was shown that Fe ions
magnetic sublattice alone provides only about 75\% of the experimental Curie
temperature $T_C^{exp}$. Gd sublattice is found to give very weak contribution
to the $T_C^{exp}$. Here we show that the missing 25 \% of $T_C^{exp}$ comes
from Fe-Gd exchange pairs.
