Abstract: Objective To modify uvulopalatopharyngoplasty(UPPP). Methods 263 patients with obstructive sleep apnea hypopnea syndrome(OSAHS) were treated with modified UPPP. In the operations, the uvula was reserved, the fat tissues of the palatine velar cleft were dissected and palatoplasty and pharyngoplasty were carried out. All patients was determined by polysomnography(PSG) before the operations and 6 months after the operations to assess the surgical outcome statistically. Results All patients were involved in this analysis. (1) 197(74.9%) patients did not need painkillers after the operations and 66(25.1%) needed painkillers. The lateral pharyngeal wall was smooth in 168(63.9%)cases and was partly split in 95(36.1%) cases. There were no complications such as breath holding or backstreaming in the nasal cavity after the operations. (2) All were followed up for more than 6 months and no deglutitive bucking or open rhinolalia were found. 95(36.1%) patients had pharyngeal foreign body sensation. Syndromes of sleep apnea disappeared in 189 (71.9%) patients and were alleviated in the other 74(28.1%) patients. In 252(95.8%)patients, the postoperative morphous of the oral cavity was content. (3) The PSG results were statistically significant between the pre-operative and post-operative for 263 patients（P＜0.05). Conclusions The modified UPPP not only extends the nasopharynx cavity but also avoids postoperative complications and improves the effects of UPPP. 

Key words: Sleep apnea, obstructive, Uvula, Palatoplasty, Pharyngoplasty