ABX Combined With Cisplatin Compared With Gemcitabine Combined With Cisplatin in NSCLC

1.18\~75 years 2.Patients who were diagnosed by the histologic, cytologic diagnosis of IIIb-IV non-small cell lung cancer 3.Presence of at least one index lesion measurable by CT scan or MRI 4.Ecog0-1 5.Expected life time longer than 12 weeks 6.Normal laboratory values: * leucocyte ≥ 4×109/L * neutrophil ≥ 1.5×109/L * platelet ≥ 100×109/L * Hemoglobin ≥ 10g/L * ALT and * AST ≤ 2.5×ULN (≤ 5×ULN if liver metastasis) 7.Signed written informed consent Exclusion Criteria: * Patients have used drugs according to protocol * Patients were allergic to pemetrexed or cisplatin * Patients received radiotherapy or other biological treatment 4 weeks before the trial * Uncontrolled hydrothorax or hydropericardium * neuropathy toxicity ≥ CTC 3 * Severe symptomatic heart disease * Active upper gastrointestinal ulcer or digestive disfunction * Severe infection or metabolic disfunction * Patients with other malignant tumor * Uncontrolled brain metastases * Patients have accepted other clinical trials * Female patients during their pregnant and lactation period, or patients without contraception