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sleep apnea syndrome damage the quality of human sleeping.It affect the body's blood oxygen content, and increase the anoxia risk of human brain, muscle and other organizations.In the traditional treatment,due to time and venue constraints,,doctors often only according to the patient or his family to judge the disease condition,can not make an intuitive evaluation on the patient's condition and treatment program.In order to facilitate the recording of the patient's sleep and respiratory status, we proposed.a sleep breathing monitoring system based on the sound collection program.The electret sound sensor is a sampling element.Combined with STM32 platform and Fatfs file system to achieve breathing sound collection and storage.Using threshold segmentation method and Matlab for data processing.The results show that,the system can realize the storage, reading, analysis and waveform display of the monitoring data.The system is easy to use, high precision, stable and reliable, It can reflect the patient's sleep breathing, the anoxia is less than 10%, The system show a high clinical value.