  Inspired by the Einstein-Born-Infeld black hole, we introduce the isolated
horizon to study the Kehagias-Sfetsos (KS) black hole in the deformed
Ho\v{r}ava-Lifshitz gravity. This is because the KS black hole is more close to
the Einstein-Born-Infeld black hole than the Reissner-Nordstr\"om black hole.
  We find the horizon and ADM masses by using the first law of thermodynamics
and the area-law entropy. The mass parameter $m$ is identified with the
quasilocal energy at infinity. Accordingly, we discuss the phase transition
between the KS and Schwarzschild black holes by considering the heat capacity
and free energy.
