Non-small cell lung cancer (NSCLC) is one of the malignant tumors with the highest incidence of brain metastases. Patients with brain metastasis showed poor prognosis and displayed an untreated median survival of only 3-6 months, and most patients died due to the progression of brain metastases. Some research showed that Icotinib alone can improve the efficiency of NSCLC with brain metastases, but there is still unknow about the result about combination with EGFR-TKI and radiotherapy. This study is designed to evaluate the efficacy of icotinib combined with radiotherapy for NSCLC patients with brain metastases.