Objective To study the clinical efficacy of concurrent chemoradiotherapy in the treatment of advanced non small cell lung cancer (NSCLC). Methods 102 cases of advanced NSCLC treated in our hospital in 2014 were selected and randomly divided into the observation group and the control group. Patients in control group were treated by chemotherapy with Paclitaxel combined Cisplatin (TP), while those in observation group were treated by concurrent chemoradiotherapy with three- dimensional conformal radiotherapy and TP. The clinical efficacy and adverse reactions of the two groups were observed. Results The total effective rate of the observation group and the control group were 43.14% and 21.57% (P<0.05), respectively. The total control rate of the two groups were 84.31% and 66.67%(P<0.05). In two groups III ~ IV gastrointestinal tract reaction, leukopenia, bone marrow suppression occurrence had no statistical significance(P>0.05). Incidence of radiation pneumonitis and radiation esophagitis increased in observation group(P<0.05). The difference of quality of life between the two groups was statistically significant(P<0.05). Conclusion Concurrent radiotherapy and chemotherapy in the treatment ofadvanced non-small cell lung cancer(NSCLC)can not only significantly improve the treatment, tumor control rate and quality of life, but also make adverse reaction increased. Treatment options should be chosen based on individual circumstances into account