  We study the triple points and phase diagrams in the extended phase space of
the charged Gauss-Bonnet black holes in $d$-dimensional anti-de Sitter space,
where the cosmological constant appears as a dynamical pressure of the system
and its conjugate quantity is the thermodynamic volume of the black holes.
Employing the equation of state $T=T(v, P)$, we demonstrate that the
information of the phase transition and behavior of the Gibbs free energy are
potential encoded in the $T-v$ ($T-r_{h}$) line with fixed pressure $P$. We get
the phase diagrams for the charged Gauss-Bonnet black holes with different
values of the charge $Q$ and dimension $d$. The result shows that the
small/large black hole phase transitions appear for any $d$, which is
reminiscent of the liquid/gas transition of a van der Waals type. Moreover, the
interesting thermodynamic phenomena, i.e., the triple points and the
small/intermediate/large black hole phase transitions are observed for $d=6$
and $Q\in(0.1705, 0.1946)$.
