We have treated 14 cases of late lung cancer, which are not suitable to the treatment of surgical operation and radiotherapy, with N2 laser as well as chemotherapy, traditional Chinese herbs and immuization from April 1980 to May 1982, observation for over 6 months show that there are 9 survivors, while there is only one survivor of the 14 cases in the control group. Our results indicate that N2 laser may be useful to cure the late lung cancer.