Social Evaluation is an important reference to guide the reform and development of a public hospital. In view of the patient, hospital stakeholders and the public, West China Hospital of Sichuan University creatively constructed a social evaluation system, including patient satisfaction degree, expert appraisal and online public comment, in order to maintain a good medical environment. After several years of construction and application, the system has been quite effective in promote the development of the hospital. In the assessment of patients' satisfaction degree toward the hospital, we made a great improvement.