Angiotensin-converting enzyme inhibitors (ACEIs) was demonstrated protective effect for patients with mild to moderate chronic kidney disease (CKD). The ACEIs was usually applied to patients while his serum creatinine (Scr) levels were no more than 3.0 mg/dL. However, it could induce AKI even in the patients with mild to moderate CKD combined with CHF. We report a case of a 62-year-old male with CHF and moderate CKD (SCr: 1.9 mg/dL) who subsequently and transiently develop AKI after he was administrated benazepril 2.5mg/day. Using the Naranjo, benazepril was found to be a probable cause of AKI in the patient. ACEIs, classified as RAAS inhibitors, can induce AKI in some conditions. Attention should be given to benazepril therapy in patients with mild to moderate CKD and CHF. Routine hemodynamic examination and biochemical monitoring was suggested before and during the period of benazepril therapy.