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We study thermodynamic instability of a class of $(n+1)$-dimensional chargeddilaton black holes in the background of anti-de Sitter universe. We calculatethe quasilocal mass of the AdS dilaton black hole through the use of thesubtraction method of Brown and York. We find a Smarr-type formula and performa stability analysis in the canonical ensemble and disclose the effect of thedilaton field on the thermal stability of the solutions. Our study shows thatthe solutions are thermally stable for small $\alpha$, while for large $\alpha$the system has an unstable phase, where $\alpha $ is a coupling constantbetween the dilaton and matter field.

Thermodynamic instability of charged dilaton black holes in AdS spaces