  We study the critical phenomena of Kerr-AdS black hole. Phase structures are
observed at different temperatures, $T_{L}$, $T_{c1}$ and $T_{c2}$ with various
features. We discuss the thermal stability considering the isothermal
compressibility and how phase transitions related to each other. The asymptotic
value of the angular momentum also has an implication on separating stable and
unstable part. Near critical temperature $T_{c1}$, the order parameter is
determined to calculate the critical exponents. All the critical exponents
($\alpha$,$\beta$,$\gamma$,$\delta$)=(0,1/2,1,3) are identical to that of mean
field systems. We plot the phase diagram near this critical point, and discuss
the scaling symmetry of the free energy.
