Objective To evaluate the efficacy and safety of amoxicillin/sulbactam (AMX/SBT) in the treatment of acute bacterial infections. Method A multicentre randomized controlled clinical trial was conducted. Ampicillin/sulbactam (AMP/SBT) was chosen as the control drug. 113 patients were enrolled in the study (58 cases in test group and 55 cases in control group). AMX/SUL and AMP/SUL were administered 4.5-6.0 g and 4.5-12.0 g every day respectively. Both drugs were given intravenously for 7-14 days. Results The cure rates and the efficacy rates of the two groups were 75.86%, 80.0% and 94.83%, 98.18% respectively. The β-lactamase producing rates were 67.35% , 69.57% and the bacterial clearance rates were 93.88%, 95.65%.There were no significant differences of the above results between the two groups (Pgt;0.05). There was no serious adverse drug reaction in AMX/SBT groups. Conclusion This study suggests that AMX/SBT is an effective and safe drug for treating acute bacterial infections.