We applied an endoscopic Nd-YAG laser therapy for an early hilar lung cancer complicated with hemophilia A in a patient of 62-year-old male. Abnormality was pointed out by means of sputum cytology. But, no shadow of tumor was observed by chest x-ray films and computed tomogram. By a bronchoscopy, a mild irregular mucomembrane and stenosis without tumor were exhibited. By means of cytological diagnosis of an abrasive-washing specimen of that region, the presence of squamous cell carcinoma was proved. Also, he was diagnosed as factor VIII deficient hemophilia A. So we performed him a laser therapy in place of the operation and with an intrabronchial arterial infusion. After the laser treatment, the conditions progressed better without any recurrence but about one and a half years later, an intrapulmonary metastasis occurred. Then, radiation and chemotherapy have been applied and at present, the patient is in a good state although under the tumor-bearing condition.