Objective: To investigate the characteristics of sleep posture and turnover frequency in male obstructive sleep apnea-hypopnea syndrome (OSAHS) patients with different severity and to analyze its role in the development of OSAHS. Methods: A retrospective analysis of male patients undergoing polysomnography was performed in 184 patients after removal of outliers. According to AHI, there were 22 cases in the normal group, 25 cases in the mild group, 29 cases in the moderate group, and 108 cases in the severe group. According to the results of polysomnography, a statistical analysis was made of the night posture, turnover frequency and some basic information of 4 groups. Results: The BMI of the 4 groups had statistical differences. People who in the supine position that the AHI and heart rate were significantly higher than subjects in non-supine position. subjects in the non-supine position were more inclined to the right lateral position. The time between the supine position and the turnover frequency during sleep was statistically significant (r=0.579, P<0.01). Among them, the mild group had the highest turnover frequency but the least time in the supine position. Conclusion: The severity of OSAHS patients is closely related to obesity. Taking the lateral position rather than the supine position can effectively increase blood oxygen saturation and reduce heart rate and adverse respiratory events. Changes in the number of turn over during sleep at night may play an important role in the patient’s long-term disease development. Some patients may increase the turnover frequency during long-term snoring to reduce the occurrence of respiratory obstruction during sleep, especially in patients with mild OSAHS.