We have studied the expression of nm23(NDP) in 50 cases nasopharyngeal biopsies with anti-nm23(NDP) antibodies. As a result, the NDP positive rate in nasopbaryngeal carcinoma (NPC) (95.54%) markedly increased (P<0.05), as compared with that in the normal nasopharyngeal epithelia (50.00-60.00%) and lymphocytes (52.00%). There were cytoplasmic type, nucleus type and mixed cytoplasmonucleus type according to NDP location in a cell. Their positive rates were 64.44%, 15.56% and 20.00% respectively in nasopharyngeal carcinoma. The expression of NDP had no relation with cervical lymphometastases in NPC, and the NDP positive rates had no significance between bilateral cervical iymphometastases and unilateral (P<0.05). But the NDP expression had most relation with the NPC staging. The expression rate and the intensity in III or IV stage patients were markedly higher than that in II stage. It points out that the high-level expression of NDP had relation with the rapid cellular proliferation in NPC, and it may indicate the bad prognoses.