Changsha TNM staging system was analyzed to evaluate its clinical value basing on 1101 NPC patients' patient' treated by radiotherapy in our hospital from 1975 to 1980. The results showed that the Changsha system could reflect the treatment result with the 5-year survival rates of 82% in stage I, 63.4% for stage II, 52.3% in stage III and 33.7% in stage IV. The author suggests to modify some points as follows: 1. primary cancer is limited inside the nasopharynx as T1, primary cancer involving tissue outside nasopharynx as T2, cranial nerve involved as T3 and destruction of base of skull as T4; 2. Stage IV should be divided into two groups—T4N0-3M0 or T0-4N3M0 as stage IVa and M1 as stage IVb, respectively.