  In this paper, we investigate the thermodynamics of D-dimensional charged
Gauss-Bonnet black holes in anti-de Sitter spacetime. Varying the cosmological
constant, Newton constant and Gauss-Bonnet coupling constant in the bulk, one
can rewrite the first law of thermodynamics for black holes. Furthermore, we
introduce the central charge and study the critical behaviors, which show the
apparent discrepancy from other black holes. Based on this approach, we
disclose the phase transition structures in $D=4, 5$, and $6$. Besides, a
triple point where the small/intermediate/large black holes can coexist is
found in $D=6$.
