The paper analyzes problems existing in the traditional outpatient diagnosing distribution process of hospitals, redesigns and optimizes the triage process. It designs a unified diagnosing distribution system, introduces the advantages, system composition, queuing rules and treatment priority strategies of the optimized process, and illustrates the application effects of the diagnosing distribution system with the outpatient of obstetrics and gynecology department of a large grade-III level-a hospital as an example.