OBJECTIVE In order to investigate the treatment of obstructive sleep apnea syndrome (OSAS) METHOD: The improved uvulopalatopharyngoplasty (UPPP) operations were performed on 64 cases. RESULT The clinical results showed that 70. Thirty-one percent of the operated patients somewhat improved and 29. Seventy percent unimproved. CONCLUSION UPPP is one of the effective methods to treat OSAS, especially for OSAS with stricture in pharyngeal cavity. It has less damage, less operative complications and so on.