Objective To improve medical quality and patients' satisfaction degree by introducing PDCA cycle as a scientific tool to the hospital management.Method We implemented PDCA circle in the links of medical quality forming as service quality,service attitude and hospital environment.And then 500 patients were surveyed of their satisfaction degree of the hospital.Data were analyzed with one-way ANOVA.Result and conclusion PDCA cycle is an effective tool to improve patients' satisfaction degree,especially within clinical service and medical technique departments.