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Objective: This study aimed to determine the impact of type 2 diabetes mellitus (T2DM) on clinical outcomes of gastric cancer (GC) patients and explore whether mefformin use and good glycemic control could reverse it.Methodst: Clinicopathologic data of consecutive GC patients who underwent gastrectomy at Nanfang Hospital between October 2004 and December 2015 were included.Propensity score matching (PSM) was performed to balance the important factors of the disease status between non-T2DM and T2DM group.The last follow-up time was January 2019.Results.A total of 1,692 eligible patients (1,621 non-T2DM vs.71 T2DM) were included.After PSM,nonT2DM group (n=139) and T2DM group (n=71) were more balanced in baseline variables.The 5-year cancerspecific survival (CSS) rate in T2DM group (47.0％) was inferior to that in non-T2DM group (58.0％),but did not reach statistical significance[hazard ratio (HR)=1.319,95％ confidence interval (95％ CI): 0.868-2.005,P=0.192].While the 5-year progress-free survival (PFS) rate of T2DM group (4g0.6％) is significantly worse than that in nonT2DM group (56.3％) (HR=1.516,95％ CI: 1.004-2.290,P=0.045).Univariate and multivariate analyses showed that T2DM was an independent risk factor for PFS but not for CSS.In T2DM group,mefformin use subgroup was associated with superior 5-year CSS and PFS in compared with non-metformin use subgroup,although the difference was not statistically significant (5-year CSS: 48.0％ vs.45.4％,HR=0.680,95％ CI: 0.352-1.313,P=0.246;5-year PFS: 43.5％ vs.35.7％,HR=0.763,95％ CI: 0.400-1.454,P=0.406).The 5-year CSS rate was 47.5％ in good glycemic control subgroup and 44.1％ in poor glycemic control subgroup (HR=0.826,95％ CI:0.398-1.713,P=0.605).And both two subgroups yielded a similar 5-year PFS rate (42.2％ vs.36.3％,HR=0.908,95％ CI: 0.441-1.871,P=0.792).Conclusions: DM promoted disease progress of GC after gastrectomy but had not yet led to the significant discrepancy of CSS.For GC padents with T2DM,metformin use was associated with superior survival but without statistical significance,while better glycemic control could not improve the prognosis.