This study aims to conduct a prospective, multicenter, double-blind, randomized, placebo-controlled trial. The planned sample size is 432 patients, with the ratio of the Fuzheng Huayu group to the placebo control group being 1:1. Participants will be randomly assigned to the two groups using a stratified block randomization method at the central level. The Fuzheng Huayu group (Fuzheng Huayu tablets combined with conventional antiviral therapy) and the placebo group (placebo combined with conventional antiviral therapy) will be treated for 48 weeks, followed by a 96-week follow-up. The study period will last for a total of 2 years. The cumulative incidence of recurrent decompensation events within 1 year, the cumulative incidence of recompensation within 1 year, the incidence of liver failure, liver cancer, and liver disease-related deaths will be analyzed. The efficacy and safety of Fuzheng Huayu tablets in reducing the recurrence of decompensation events in patients with first-time decompensated hepatitis B cirrhosis will be clarified, providing a basis for clinical practice.