Acute airway obstruction is a serious emergency in children. This is a case report of airway obstruction due to subglottic necrotic tissue following endotracheal intubation. This 7-year old male patient was performed an endotracheal intubation for airway keep after car acident. The endotracheal tube remained in place for approximately 6 hours. After extubation, he was suffered from dyspnea and this symptom was exacerbated gradually. 3 days later, necrotic granulation tissue on subglottic area was removed by surgical intervention. After this procedure his problem and symptom was improved. It was considered that the formation of necrotie granulation tissue on subglottic area was a complication of endotracheal intubation. Histopathologic finding showed acute and chronic inflammatory cell infiltration and degeneration with necrotic change.