Objective:To understand the SaO 2, sleep quality and ment a l health level in people with administration or technique working in Qinghai-Tib et railway, and explore the relative factors of mental health level Me t hods: By randomized clustering sampling, 117 administrative personnel in Qinghai-Tibet railway selected as a study group and 90 administrative personnel in Chongqing selected as a control group were evaluated using Pittsburgh sleep quality index (PSQI) and SCL-90 questionnaires and were measur...