Objective To investigate the occurrence of acute kidney disease(AKD)in patients with decompensated hepatitis B cirrhosis,and to analyze its impact on the clinical prognosis of patients.Methods The inpatients with decompensated hepatitis B cirrhosis who first visited Lanzhou University First Hospital from January 2020 to December 2021 were screened and included.The clinical data at the time of initial admission were collected,and the patients were followed up for 90 days,and the patients survival was recorded.Results The incidence of AKD in patients with decompensated hepatitis B cirrhosis was 38.3%(51/133).Concurrent SBP[odds ratio(OR)12.251,95%CI 1.049-143.052)]and low eGFR(OR0.872,95%CI 0.824-0.922)were independent influencing factors of AKD in patients with decompensated hepatitis B cirrhosis.In terms of predicting adverse 90-day outcomes,concurrent AKD and high MELD scores were independent risk factors for 90-day death in patients with decompensated hepatitis B cirrhosis.Conclusion Concurrent SBP and renal function may be the key influencing factors of AKD in patients with decompensated hepatitis B cirrhosis,and the occurrence of AKD has an important impact on the short-term adverse outcomes of patients with decompensated hepatitis B cirrhosis.