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Background: Due to advances in medical treatments, a substantial proportion of heart failure (HF) patients with reduced left ventricular ejection fraction (EF, HFrEF) have experienced partial or complete recovery of EF, termed HFrecEF, and markedly improved clinical outcomes. In the present study, we sought to investigate the relationship between glycemic control and the incidence of HFrecEF in patients with type 2 diabetes mellitus (T2DM).Methods: A total of 385 T2DM patients with HFrEF were consecutively enrolled. Follow-up echocardiogram was performed after 6 to 12 months, which classified patients into HFrecEF or persistent HFrEF. Clinical outcomes of cardiovascular (CV) death and HF rehospitalization were analyzed during a mean of 3.3 years follow-up. Results: T2DM patients with HFrecEF had significantly lower HbA1c level than those with persistent HFrEF (6.4% [IQR 5.8%~7.1%] vs. 6.8% [IQR 6.1%~7.8%], P=0.001), especially in HF of ischemic etiology. After multivariate adjustment, every 1% increase in HbA1c conferred a 21.3% (OR: 0.787 [95% CI 0.658~0.933]) lower likelihood of HFrecEF. Compared to patients with good glycemic control (HbA1c≤6%), those with poor glycemic control (HbA1c > 8%) had higher risk of CV death or HF rehospitalization (HR: 2.778 [95% CI 1.470~5.251]). T2DM Patients with HFrecEF exhibited significantly better clinical outcomes than those with persistent HFrEF.Conclusions: This study demonstrates that T2DM patients with uncontrolled HbA1c levels were associated with compromised development of HFrecEF and worse clinical outcomes.