It can lead to death or tracheal stenosis if not being discovered and treated as soon as possible. Objective: Evaluate the result of the endoscopic surgery in the management of laryngeal and tracheal trauma by using fiber optic laryngo-tracheal and pulmonairy funtion test. Patients: 54 laryngo-tracheal trauma cases have been treated by endoscopic surgery at the ENT department of Cho Ray Hospital the 5/2007 to 6/2009 and follow up the 3 months to 28 months after surgery. Design: prospective clinical trial study. Research method: Using Fiberoptic nasolaryngotrachealscopy and pulmonairy funtion test to evaluate objectively the laryngotracheal tube after endoscopic surgery in the management of laryngeal and tracheal trauma.