In the proposed study, the investigators plan to evaluate the efficacy and safety of Piperacillin sodium and sulbactam sodium for injection (2:1) for the treatment of respiratory and urinary tract acute bacterial infection under the widely used in clinical conditions.

Piperacillin sodium and sulbactam sodium for injection (2:1) plays a therapeutic role by the former inhibiting bacterial cell wall synthesis by irreversible competitive inhibition of β-lactamase. The antimicrobial effect of cefotaxime can be enhanced by the two combined. The compound specifically aims to the mechanism of bacterial resistance, extending the life of Piperacillin in the treatment-resistant pathogen infections.

Inclusion Criteria:

1. patients who qualify for moderate and severe acute respiratory or urinary tract bacterial infection of acute bacterial infections need for systemic antibiotic therapy.
2. Age>18 years old, Gender: both
3. Women of childbearing age were to be negative pregnancy test and agree to take contraceptive measures during the trial;
4. patients were volunteers and signed informed consent form;
5. patients did not participate in other clinical trials.

Exclusion Criteria:

1. Patients were hypersusceptibility to the test drug or other penicillins ,β-lactamase inhibitor
2. Pregnant and Lactating women
3. Patients have severe liver,kidney,cardiovascular,cerebrovascular,endocrine and hematopoietic system of primary diseases and that of immunodeficiency,advanced cancer or mental illness.
4. Patients who were complicated by other diseases and thought to affect efficacy evaluations or poor compliance.