ObjectiveTo systematically review the efficacy and safety of Xinmailong injection in the treatment of different types of heart failure with ejection fraction.MethodsCNKI, WanFang Data, VIP, CBM, PubMed, EMbase and The Cochrane Library databases were electronically searched to collect randomized controlled trials (RCTs) of Xinmailong injection in the treatment of different types of heart failure with ejection fraction from inception to August 5th, 2020. Two reviewers independently screened literature, extracted data and assessed risk of bias of included studies. Meta-analysis was then performed using RevMan 5.3 software.ResultsA total of 25 RCTs involving 2 467 patients were included. The results of meta-analysis showed that Xinmailong injection combined with conventional therapy was superior to conventional therapy alone on NYHA classification efficiency (HFrEF: RR=1.32, 95%CI 1.04 to 1.69, P=0.02), comprehensive clinical efficacy (HFrEF: RR=1.24, 95%CI 1.15 to 1.34, P<0.000 01; HFpEF: RR=1.22, 95%CI 1.15 to 1.30, P<0.000 01), score of life quality (HFrEF: MD=?7.08, 95%CI ?9.34 to ?4.82, P<0.000 01), left ventricular ejection fraction (HFrEF: MD=4.99, 95%CI 3.18 to 6.80, P<0.000 01; HFpEF: MD=5.10, 95% CI 0.62 to 9.58, P=0.03), the level of B-type natriuretic peptide (HFrEF: SMD=?0.96, 95%CI ?1.36 to ?0.56, P<0.000 01; HFpEF: SMD=?1.83, 95%CI?2.35 to ?1.31, P<0.000 01), the level of N-terminal pro-B natriuretic peptide (HFrEF: SMD=?2.98, 95%CI ?4.45 to ?1.51, P<0.000 1), and 6-minute walking distance (HFrEF: MD=52.56, 95%CI 34.22 to 70.90, P<0.000 01). There was no significant difference in drug-related adverse reactions between two groups.ConclusionsCurrent evidence shows that Xinmailong injection combined with conventional therapy have good efficacy and safety in the treatment of heart failure with different ejection fractions. Due to limited quality and quantity of the included studies, more high quality studies are required to verify above conclusions.