Objective To investigate the relationship between self-efficacy and quality of life of patients with type 2 diabetes mellitus.Methods A convenient sample of 116 patients with type 2 diabetes was investigated by diabetes management self-efficacy scale(DMSES)and diabetes quality of life scale(DQOL)and the results underwent analysis.Results Both the level of selfefficacy and quality of life of patients with type 2 diabetes mellitus were low generally.Score of self-efficacy and quality of life of patients with different type of type 2 diabetes mellitus were statistically different.The level of diabetes self efficacy was moderately positivdy correlated with the level of diabetes quality of life(r=0.43,P＜0.01).Conclusions The improvement of self-efficacy and quabty of life of patients with type 2 diabetes mellitus must be thought highly of in the clinical practice which should be based on self-efficacy theory.Various methods should be adopted to arouse the potential ability of patients in order to increase their self-efficacy,so that the quality of life of patients can he improved.