From January 1988 to Decenlber 1988,191 cases of N0 nasopharyngeal carcinoma were anal-ysed. Whose nasopharyngnx(N.P)was examined by C.T. before radiotherapy and were treated by split ra-diotherapy in our hospital were canalysed. The influence factors of cerviccal lymph node recurrent were dis-cussed.The cervical lymph node recurrent rates of the upper cervical rf1diation dose> 45Gy-50Gy and >50-59Gy were not marked different(P >0.05)in C. T negative in the carotid space,but were marked dif-ferent(P <0.01)i...