1. Observe and compare the chrono-chemotherapy IMRT and conventional chemotherapy and intensity modulated radiotherapy term efficacy of the treatment of locally advanced nasopharyngeal carcinoma.
2. Evaluation chrono-chemotherapy IMRT and conventional chemotherapy and intensity modulated radiotherapy in locally advanced nasopharyngeal carcinoma safety and tolerability.

3）observing the adverse reaction and effects of two groups,expected chrono-chemotherapy group can achieve lower toxicity, improve the curative effect, for the treatment of nasopharyngeal carcinoma provides a more reasonable way.

Inclusion Criteria:

• initial treatment of advanced nasopharyngeal carcinoma Ⅲ-Ⅳ patients with pathologically confirmed (according to 2010 UICC staging, T3-4, N0-3), without evidence of distant metastasis (M0). Have measurable tumor lesions.
• KPS≥70 points.
• the age of 18-70 years old, male or female.
• no major organ dysfunction; normal bone marrow function (WBC ≥4.0 × 109 / L, platelets ≥100 × 109 / L, hemoglobin ≥90g / L), normal liver function (total bilirubin, alanine aminotransferase, aspartate aminotransferase ≤1.5 times the upper limit of normal), normal renal function (creatinine ≤ 1.5 times upper limit of normal).
• understand this study and signed informed consent.

Exclusion Criteria:

• distant metastasis.
• who had received prior chemotherapy.
• patients have physical or mental illness, and by researchers believe that patients can not be completely or fully understood in this study possible complications.
• pregnancy (via the urine or serum β-HCG test confirmed) or during lactation.
• serious complications, such as uncontrolled hypertension, heart failure, diabetes and so on.