Comparative Study of Chemoradiation and Sequential Chemoradiation About Lung Adenocarcinoma Patients With Postoperative in pN2

Inclusion Criteria: * Clinical diagnosis of Lung adenocarcinoma * Postoperative staging pN2 period * Voluntary participation and informed consent * Age ≥ 18 years old, male or female, within six months of weight loss of less than 10%, can tolerate radiotherapy * performance status( PS) score 0-2. * Hemoglobin ≥ 80 g / L, white blood cell ≥ 4 × 109 / L, platelets ≥ 100 × 109 / L. * Liver function: alanine aminotransferase (ALAT), aspartate transaminase (ASAT) \<upper limit of normal (ULN) of 1.5 times, bilirubin \<1.5 × ULN. * Renal function: serum creatinine \<1.5 × ULN. * Compliance, and can be regular follow-up, voluntary compliance with study requirements Exclusion Criteria: * Do not meet the inclusion criteria * There is evidence of distant metastases * Suffered from other malignancies in five years * Within the past January subjects received other drug trials * Having serious allergies or idiosyncratic persons, such as you can not use folic acid, dexamethasone, vitamin B12 patients * Severe lung or heart disease, a history * Refuses or is unable to sign informed consent to participate in trials * The abuse of drugs or alcohol addicts. * Patients with difficult to control bacterial, viral, fungal infections * Having a personality or mental disorders, without civil capacity or restricted civil capacity. * Being pregnant or lactating women.