(1) primary carcinoma (T) phases: T1 primary cancers confined to the nasopharynx. T1a minimal invasive lesions. T1b confined to the nasopharynx a wall or two at the junction of the walls of the limitations of lesions. T1c including two primary foci wall or two walls above. T2 primary tumor invasion and the nasal cavity, oropharynx or involved in the vicinity of the skull base following muscles and nerves. T3 original invasion and bone cancer, brain or paranasal sinuses. T2 and T3 are T4 involvement, or transgression and the next Yuanqiang, orbital or temporal fossa

  (2) cervical lymph node metastasis (N) phases: N0 no palpable lymph nodes. N1 neck area or fixed lymph nodes, 3 CM in diameter within. N2 neck diameter of 3-8 CM district activities next cervical lymph node or area within a diameter of 8 CM activities lymph nodes. N3 neck area under the CM in diameter, 8 fixed within lymph nodes, neck area any CM in diameter, more than 8 or supraclavicular lymph nodes within Waterloo or supraclavicular lymph nodes by the skin infiltration.

  (3) distant metastasis (M) phases: M0 without distant metastasis. M1 with distant metastasis or subclavian below the skin or lymph node involvement. (4) clinical stages: Stage Ⅰ T1N0M0 Ⅱ period T2N0M0, T1N1M0 Ⅲ period T3N0M0, T3N1M0, T3N2M0, T1N2M0, T2N2M0 Ⅳ period T4N0-3M0, T1-3N3M0 Ⅳ b period or Ⅴ-phase T1-4N0