Meconium peritonitis is an aseptic peritonitis that follows a perforation of the intestines in fetal life. It is a serious complication of intestinal perforation. This article reports a female newborn who was born with gestational age of 40 weeks and birth body weight of 3400 gm. She was admitted at age of 6 days, owing to persistent vomiting, abdominal distention, tachypnea and acrocyanosis since birth. The plain abdomen showed intra-abdominal calcification and intestinal distention. Under the impression of meconium peritonitis, she was treated aggressively with exploratory laparotomy, TPN and antibiotics. During operation, dense fibrous adhesions and agglutination of the intestine were found. But no intestinal perforation was noted. Culture of ascites isolated Enterobacter aerogenes. The patient's condition was gradually recovered and she was discharged at age of 32 days. According to the previous literature, meconium peritonitis is a relative rare disease with poor prognosis. So we would like to report this case.