Objective: To explore the risk factors associated with depression in type 2 diabetes mellitus (T2DM) patients with erectile dysfunction (DMED). Methods: A total of 60 male DMED patients in Kangning Hospital Affiliated to Wenzhou Medical University were enrolled.They were divided into group A (DMED with depression, 40 cases) and group B (DMED without depression, 20 cases) according to the results of self-rating depression scale (SDS). The comorbidity rate of DMED and depression was calculated.Baseline index, blood glucose control index, sex hormone index and blood lipid biochemical index were compared between the two groups.Pearson correlation analysis was used to judge the correlation between SDS scale scores and the indicators.Finally, these indicators were substituted into logistic regression analysis to find out the factors that may cause the comorbidity of DMED and depression. Results: The age of the patients in group A was older than that in group B[(55.95±6.33)years vs.(44.15±5.08)years, t=7.242, P=0.000], the course of T2DM in group A was longer than that in group B [(10.28±0.94)years vs.(4.38±0.60)years, t=29.467, P=0.000]. The fast plasma glucose (FPG)[(10.24±1.55)mmol/L vs.(8.22±1.15)mmol/L, t=5.153, P=0.000], fasting insulin (FIns) [(21.34±2.58)mU/L vs.(17.35±2.13)mU/L, t=5.967, P=0.000] and glycosylated hemoglobin (HbAlc) [(8.75±1.05)% vs.(6.55±0.84)%, t=8.146, P=0.000] in group A were higher than those in group B. Testosterone (TT) level in group A was lower than that in group B [(1.89±0.24)ng/mL vs.(2.46±0.31)ng/mL, t=-7.855, P=0.000]. The luteinizing hormone (LH) [(12.95±1.14)U/L vs.(8.53±0.70)U/L, t=18.515, P=0.000] and follicle-stimulating hormone (FSH) [(19.55±1.83)U/L vs.(15.40±1.47)U/L, t=8.808, P=0.000] in group A were higher than those in group B. Pearson analysis showed that the SDS scale score was positively correlated with age, T2DM duration, FPG, Fins, HbAlc, LH, FSH (r=0.310, 0.503, 0.465, 0.583, 0.676, 0.355, 0.540, P=0.002, 0.008, 0.017, 0.022, 0.030, 0.026, 0.011), and negatively correlated with TT level (r=-0.713, P=0.028). Logistic regression analysis showed that the age, the course of T2DM and TT were the independent risk factors which caused the comorbidity of DMED and depression. Conclusion In male T2DM patients, the independent risk factors for DMED with depression are age, long duration, and low TT level.