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Background and Objective: Surgery is the main therapy for patients with stage-ll non-small cell lung cancer (NSCLC), but patients still have an unsatisfactory prognosis even though complete resection is usually possible. Adjuvant chemotherapy provides low rates of clinical benefit as well. We retrospectively analyzed prognostic factors of patients with completely resected stage-ll NSCLC to find patients with unfavorable factors for proper management. Methods: Clinical data of 220 patients with complete resections of stage-ll NSCLC at the Sun Yat-sen University Cancer Center between January 1998 and December 2004 were retrospectively analyzed. Cumulative survival was analyzed by the Kaplan-Meier method and compared by log rank test. Prognosis was analyzed by the Cox proportional hazards model. Results: The overall 3- and 5-year survival rates were 58.8% and 47.9%, respectively. The 3- and 5-year disease-free survival rates were 45.8% and 37.0%, respectively. Of the 220 patients, 86 (39.1%) had recurrence or metastasis. A univariate analysis demonstrated that age (> 55 years), blood type, the presence of symptoms, chest pain, tumor volume (> 20 cm3), total number of removed lymph nodes (≥10), number of involved N1 lymph nodes (≥3 ), total number of removed N2 lymph nodes (> 6), and the ratio of involved N1 lymph nodes (≥35%) were significant prognostic factors for 5-year survival. In the multivariate analysis, age (> 55 years), chest pain, tumor volume (> 20 cm3), total number of removed lymph nodes (≥10), and number of involved N1 lymph nodes (≥ 3) were independent prognostic factors for 5-year survival. Conclusions: For patients with completely resectable stage-ll NSCLC, having > 55 years, presenting chest pain, tumor volumes > 20 cm3, and ≥ 3 involved N1 lymph nodes were adverse prognostic factors, and ≥ 10 removed lymph nodes was a favorable one. Patients with poor prognoses might be treated by individual adjuvant therapy for better survival.