The author experienced a case of difficult decannulation in a 52-day-old male infant, in which decannulation was performed at one and half years after tracheostomy. Tracheostomy was performed for the maintenance of airway due to severe dyspnea, cyanosis and retraction of suprasternal notch and epigastrium during the inspiration because of acute laryngotracheobronchitis. The patient became gradually adjusted to the continual cannula corking training along with growing process over the period of 18 months.