OBJECTIVE: To compare the efficacy and safety of Sacubitril valsartan sodium tablets and Benazepril hydrochloride tablets in the treatment of chronic heart failure with reduced ejection fraction, so as to explore effective medication regimens for clinical treatment. METHODS: Totally 102 chronic heart failure with reduced ejection fraction patients admitted into Changshu No. 2 People's Hospital from Dec. 2018 to Dec. 2019 were extracted to be divided into the ARNI group and the ACEI group via the random number table and opaque envelope method, with 51 cases in each group. Patients in the ARNI group received Sacubitril valsartan sodium tablets, while the ACEI group was given Benazepril hydrochloride tablets. Clinical efficacy, cardiac function indicators [left ventricular posterior wall thickness (LVPWD), left ventricular ejection fraction (LVEF), left ventricular end-diastolic diameter (LVEDD), left ventricular global longitudinal strain (GLS), radial strain (GRS) and circumferential strain (GCS) during diastole], myocardial injury markers [N-terminal precursor brain natriuretic peptide (NT-ProBNP), serum troponin I (cTn I)], inflammatory mediators and myocardial fibrosis markers [soluble growth stimulating expression gene 2 protein (sST2) levels, interleukin (IL)-1 and IL-6] before and after treatment, adverse drug reactions during medication in two groups were observed and compared. RESULTS: The total effective rate in the ARNI group was 90. 20% (46 / 51), significantly higher than that in the ACEI group (74. 51%,38 / 51), with statistically significant difference (P<0. 05). After treatment, the absolute values of LVEF, GLS and GCS of all patients were significantly higher than those before treatment, and LVPWD, LVEDD, NT-ProBNP, cTnⅠ, IL-1, IL-6 and sST2 were significantly lower than those before treatment; meanwhile, the increase of LVEF in the ARNI group was greater, and the decrease of LVPWD, LVEDD, NT-proBNP, IL-1, IL-6, cTnⅠ and SST2 was greater, with statistically significant difference (P<0. 05). After 12 months of follow-up, 1 patient developed hypotension, 1 patient developed cough, and 1 patient was readmitted to hospital, but no hyperkalemia or death was observed in the ARNI group. In the ACEI group, 1 patient developed hypotension, 1 patient developed cough, 4 patients were readmitted to hospital, and 1 patient death, but no hyperkalemia was observed. CONCLUSIONS: Compared with Benazepril hydrochloride tablets, Sacubitril valsartan sodium tablets are more effective in improving heart function, inflammatory factors and myocardial injury markers in chronic heart failure with reduced ejection fraction patients, with better clinical efficacy and similar safety. [ABSTRACT FROM AUTHOR]