Abstract: This paper gives a short review on the thermomechanical treatment (TMT) of sintered steel. High temperature thermomechanical treatment (HTMT) is a kind of TMT. It has been applied in the production of sintered steel and powder forging steel. HTMT significantly improves the ductility and fracture toughness of sintered steel and powder forging steel. Strengthening and toughening mechanism of HTMT of sintered steel was discussed. It was shown that the superiority of high temperature quenching is preserved after HTMT, i.e. to obtain dislocated lath marten site and thin retained austenite and to remove twinned acicular martensite.