Finite-Temperature QCD on the Lattice

Recent developments in finite-temperature studies of lattice QCD are reviewed. Topics include (i) tests of improved actions for the pure gauge system, (ii) scaling study of the two-flavor chiral transition and restoration of $U_A(1)$ symmetry with the Kogut-Susskind quark action, (iii) present understanding of the finite-temperature phase structure for the Wilson quark action. New results for finite-density QCD are briefly discussed.