To Compare the Effect of Different Nutritional Pathways on Improving Nutritional Status of Esophageal Cancer Patients Undergoing Chemoradiotherapy

Inclusion Criteria: * Pathologically or cytologically proven esophageal squamous cell carcinoma * Karnofsky performance score(KPS) ≧70 * Concurrent chemoradiotherapy * Hemoglobin≥90.0g/dL,white blood cell count（WBC）≥ 4000 cells/mm³,Platelet count≥100,000 cells/mm³ * Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) \< 2.5 times upper limit of normal,bilirubin normal * Creatinine normal OR creatinine clearance ≥ 60 mL/min * Patients have good compliance to treatment and follow-up of acceptance * the functions of the heart, kidney, liver were basically normal, with no chemotherapy and radiotherapy contraindications Exclusion Criteria: * Patients with severely bowel function impaired or can not tolerate enteral nutrition * Patients with serious gastrointestinal obstruction, be unable to take food by mouth and can not / do not want to a feeding tube inserted * Patients who have severe vomiting, gastrointestinal bleeding, intestinal obstruction * Patients who have distant metastasis * The primary tumor or lymph node already received surgical treatment efuse or incapable to sign the informed consent form of participating this trial