The surgical outcome for 209 early lung cancers was clinically evaluated. 1) Most (93%) of Stage I cancers were composed of pT1N0 and pT2N0 while 6.3 % was pT1N0. 2) Even in early cancer, nodal involvement and distant metastasis occurred and these related closely to their prognoses. 3) Reoperation should be indicated for recurrence with a 10 month or more time interval from the first operation and should be recommended, if possible. Advances in diagnostic technique for lung cancer have been achieved. As a consequence, early lung cancer has become clinically detected and the surgical curability has been improved with time. This study was undertaken to evaluate surgical treatment for stage I lung cancer patients.