  We study the deconfinement transition in two-flavour lattice QCD with
dynamical overlap fermions. Our simulations have been carried out on a $16^3
\times 6$ lattice at a pion mass around 500 MeV with a special HMC algorithm
without any approximation such as fixed topology. We consider several
temperatures from 220 MeV which is close to the deconfinement to 280 MeV which
is above it. The dependence of the Polyakov loop, the chiral condensate, the
Dirac spectra and the connected part of chiral susceptibility on the inverse
gauge coupling has been studied. Our data indicates that the transition point
lies between $\beta = 7.6$ and $\beta = 8.1$, but a more precise determination
is not possible with our present statistics.
