Randomized Double-blind Controlled Clinical Study of SGLT-2i Combined With Probiotic Preparations in Elderly Patients With HFpEF

Inclusion Criteria: * 1\. Age over 60 years; 2.Relevant investigations within 6 months meet diagnostic criteria for HFpEF: 1. epidemiologic and population characteristics of patients with HFpEF; 2. presence of symptoms and/or signs of heart failure; 3. Cardiac imaging suggests LVEF \>=50%; 4. BNP\>=35pg/ml and (or) NT-pro BNP\>=125pg/ml in sinus rhythm, and BNP\>=105pg/ml and (or) NT-pro BNP\>=365pg/ml in atrial fibrillation; 5. at least one of the following conditions is met: 1) LVMI\>=115 g/m\^2(male)or 95 g/m\^2(female); 2) LAVI\>34 ml/m\^2; 3) Relative wall thickness\>0.42;or left ventricular free wall thickness\>12mm; 4) E/e'\>=14; 5) Ventricular septal e'\<7cm/s, or lateral wall e'\<10cm/s, or mean e'\<8cm/s; 6) Tricuspid regurgitant velocity\>2.8m/s, or pulmonary artery systolic pressure\>35mmHg; 3.NYHA class II to III for cardiac function; 4. not taking SGLT-2 inhibitors within 6 months before enrollment; 5. no probiotic preparations taken within 3 months before enrollment; 6. The current anti-HF Therapeutic Regimen is well tolerated by patients and is stable for at least 1 month; 7. Currently stable HF with no acute exacerbations; 8. Cognitive Functioning is basically normal with comprehensible assessment scale content; 9. possess basic behavioral ability, being able to perform daily activities independently or with the help of accessory aids; 10. Understand the purpose of the Clinical Study, voluntarily participate and sign informed consent. Exclusion Criteria: * 1\. the patient's symptoms are due to noncardiac disease; 2. In those with contraindications to Henggliflozin: 1. those who are allergic to henggliflozin; 2. severe renal impairment (eGFR\<30ml/min/1.73m\^2), end-stage renal disease, or those requiring dialysis; 3. In those with contraindications to probiotics: <!-- --> 1. Patients with severe impairment of the intestinal barrier associated with sepsis, active massive bleeding from the digestive tract, perforation, and other causes. 2. those with current diagnosis of fulminant colitis or toxic megacolon. 3. Enteral feeding that cannot tolerate 50% caloric requirement due to severe diarrhea, significant fibrous intestinal stenosis, severe gastrointestinal bleeding, high-flow intestinal fistula, etc. 4. Patients with congenital or acquired immune deficiency. 5. Those recently treated with high-risk immunosuppression or cytotoxic drugs: e.g., continued use of rituximab, doxorubicin, or a medium-to high-dose steroid hormone (20 mg/d prednisone or higher) for more than 4 weeks. 6. Severe immunosuppression: Neutrophils \<1 500/mm\^3. 4. had a myocardial infarction within 6 months before enrollment, had a coronary artery bypass graft procedure, or had any event that could reduce LVEF (unless an LVEF \>=50%) confirmed; 5. valve replacement surgery within 6 months before enrollment; 6.Poor blood pressure control (SBP\>=180mmHg or DBP\>=100 mmHg); 7. Current acute decompensated heart failure requires treatment; 8. Resting heart rate exceeding 120 beats/min, or complicated by malignant Arrhythmia; 9. Significant coronary artery lesions require PCI revascularization; 10. Severe renal insufficiency (blood creatinine, Cr \>442μmol/L) or receiving dialysis treatment; 11. Patients with urinary tract infection at entry; symptoms and signs of urinary tract infection, such as urinary tract irritation signs (frequent urination, painful urination, urgency), pain and tenderness above the pubic bone, fever, pain or percussion pain in the waist, etc., and urine bacterial culture colony counts \>=105/ml; 12. currently having a malignancy that requires treatment; 13. Current concurrent acute disease or acute exacerbation of chronic disease; 14.Participated in other interventional investigators within 3 months.