  In these lectures, we introduce finite temperature QCD on the lattice to
non-experts of the subject. We first formulate lattice QCD both at zero and
finite temperatures. Then a section is devoted to the topic of improved lattice
actions which are becoming an essential ingredient of precision studies of QCD
on the lattice. We then discuss about finite temperature SU(3) gauge theory,
i.e. QCD without dynamical quarks (quenched QCD). Finally, we report recent
status of studies in full QCD taking into account the effects of dynamical
quarks.
