Inclusion Criteria:  Newly histologic diagnosis of nasopharyngeal carcinoma; All genders, range from 18-70 years old; Clinical stage II-IVa according to the 8th edition of the Union for International Cancer Control/American Joint Committee on Cancer (UICC/AJCC) staging system; Patient-Generated Subjective Nutrition Assessment (PG-SGA) score ≤8; Main organ functions test should be satisfied the following conditions: (1) Absolute neutrophil count (ANC) ≥1.5×10^9/L; (2) Platelet (PLT) ≥80×10^9/L; (3) Hemoglobin (Hb) ≥90 g/L; (4) Bilirubin < 1.5 times the upper limit of normal value (ULN), aspartate aminotransferase (AST) and alanine aminotransferase (ALT) < 2.5 times the upper limit of normal value; (5) Creatinine < 1.5 times the upper limit of normal value or creatinine clearance rate >60 ml/min.  Exclusion Criteria:  Patients whose energy intake is less than 60% of the target energy requirement for 3 days or more; Have or are suffering from other malignant tumors; Refuse concurrent chemoradiotherapy; With diabetics, galactosemia, or sever metabolic diseases or endocrine diseases; Cannot take oral or enteral nutrition, including intestinal obstruction, severe short bowel syndrome or high output fistula, or with severe digestive system diseases; Known allergic reaction to any component of Abbott®Ensure, or severe allergic constitution; Pregnant or lactating women; With previous or ongoing clinical trials; Refuse to sign inform consent form.