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In psychiatry, the remission of diseases and the recovery of disabilities have been the critical points of treatment. And the scales which evaluate the functions and disabilities of patients were needed to see the remission of diseases and the recovery of disabilities. Among these functional scales, Global Assessment of Functioning Scale (GAF) and Social and Occupational Functioning Scale (SOFAS) were widely used to indicate psychosocial functions. GAF and SOFAS are 100 point single-item global scale to evaluate the functions of patients, and have advantages to apply in short time. And these scales have high reliability, predict the course of subjects, and reflect the patients’ changes sensitively. Therefore, these scales were used frequently in clinical situation. To use GAF more effectively, clinician training and constructive use of GAF-total, GAF-symptom, and GAF-disability are needed.