Patients meeting the criteria of obstructive sleep apnea were included, and all patients signed informed consent, which met the requirements of the ethics Committee of our unit. All subjects were hospitalized patients. Subjects were randomly enrolled into High-flow Nasal Cannula Oxygen Therapy group or Continuos Positive Airway Pressure group for 1 month of treatment. Sleep respiration monitoring data including AHI, blood oxygen saturation decline index (ODI) and minimum blood oxygen saturation were recorded before and after treatment. After one month of the first stage of treatment, patients voluntarily continued to receive treatment and observers were included in the second stage of treatment. HFNC group and CPAP group continue to receive corresponding treatment for 6 months.Before and after the study, sleep respiratory monitoring datas,treatment failure rate，good compliance rate are recorded.
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AHI
Timeframe: Change from Baseline AHI data at 1 month and 6 months.
Treatment failure rate
Timeframe: about sixth month
Good compliance rate
Timeframe: about sixth month
mean apnea time
Timeframe: Change from Baseline mean apnea time data at 1 month and 6 months.
longest apnea time
Timeframe: Change from Baseline longest apnea time data at 1 month and 6 months.
Mean oxygen saturation
Timeframe: Change from Baseline Mean oxygen saturation data at 1 month and 6 months.
minimum oxygen saturation
Timeframe: Change from Baseline minimum oxygen saturation data at 1 month and 6 months.
ODI
Timeframe: Change from Baseline ODI data at 1 month and 6 months.
oxygen saturation < 90 % cumulative timesaturation
Timeframe: Change from Baseline oxygen saturation < 90 % cumulative timesaturation data at 1 month and 6 months.
Gender
Timeframe: by experiment finished:about 1 year
age
Timeframe: by experiment finished:about 1 year
height
Timeframe: by experiment finished:about 1 year
weight
Timeframe: by experiment finished:about 1 year