Application of multi-center, prospective study on the severity of postoperative cholangitis biliary atresia classification, according to the degree of cholangitis targeted therapy, to improve the therapeutic effect of postoperative cholangitis biliary atresia, decrease the overuse of antibiotics related complications.

Cholangitis patients post-kasai Portoenterostomy were grouped by cholangitis severity score, according to the severity was divided into mild, moderate, severe cholangitis, all levels of cholangitis patients were divided into subgroups by age and post-kasai Portoenterostomy jaundice matching design of experiment, then they were randomly divided into control group and experimental group, and all the control group unified antibiotic treatment, the experimental group was graded antibiotic treatment according to the severity cholangitis, after three days treatment，evaluate each treatment effect, average hospitalization days, the average hospitalization expenses, antimicrobial drug use strength to evaluate the therapeutic effect of postoperative cholangitis biliary atresia.

Inclusion Criteria:

1. Age 3 months to 2 years old, gender is not limited.
2. Patients with cholangitis post-kasai Portoenterostomy.
3. No other treatment before entering the group.
4. The patient must sign an informed consent form and can actively cooperate with the treatment and follow-up.

Exclusion Criteria:

1. Patients with other infectious lesions.
2. Patients with other severe deformity.
3. Patients with end-stage liver failure.
4. Patientsn with liver transplantation.
5. Patients with mental symptoms or other disease.