 EGFR-TKI is good for the patients with EGFR-mutant non-small cell lung cancer.We design this clinical trail to confirm if the efficacy of Epidermal Growth Factor Receptor Tyrosine Kinase InhibitorEGFR-TKI ICOTINIB is better than whole brain irradiation for the patient with EGFR-mutant non-small cell lung cancer. 