If diabetic patients with combined heart failure need to adjust the application of hypoglycemic drugs, as follows: 1. Patients with diabetes combined with heart failure are preferred to be treated with SGLT-2 inhibitors, the representative drugs are Cagliflozin and Dagliflozin, such drugs excrete glucose through the kidneys and reduce blood volume, which can reduce the heart load to a certain extent and relieve the symptoms of heart failure in patients and can better control blood sugar. 2. Patients with diabetes combined with heart failure are accompanied by obvious panic, chest tightness, breathlessness and severe hypoxemia, avoid applying metformin treatment, because the application of metformin in the hypoxic state has increased the risk of lactic acidosis. 3, patients with diabetes combined with heart failure need to avoid the use of thiazolidinediones drug therapy, the representative drugs for pioglitazone, rosiglitazone, because such drugs have increased sodium and water retention The risk of heart failure can be induced and aggravated.