In this study, we established radioresistant NPC cell line CNE2-RR to illuminate the mechanism of NPC radioresistance, and found that the HRR pathway related genes NFBD1, BRCA1, BRCA2, RAD51 and RPA1 are involved in the radioresistance of NPC. The gene discussed is BRCA1; the disease is nasopharyngeal carcinoma.