Abstract： Objective To observe the effects of alprostadil injection on intestinal mucosal barrier function in patients with acute pancreatitis(AP). Methods Seventy-eight AP patients admitted in Department of Medicine in Yuhang District Second People's Hospital of Hangzhou City from May 2016 to March 2017 were divided into 2 groups using random number method,including 38 cases in the control group and 40 cases in the treatment group. Patients in the control group received routine treatment. Patients in the treatment group were given intravenous 10 μg/d alprostadil injection in addition to routine treatment continuously for 14 days. Another 40 healthy volunteers who underwent routine examination in the same period were enrolled as healthy control group. The scores of MCTSI and APACHEⅡwere recorded at admission and 2 days after the treatment. The levels of serum DAO, endotoxin (ET) and IFABP were detected by ELISA. Results There were no significant difference on the scores of MCTSI and APACHEⅡ, the levels of serum DAO, ET, IFABP before treatment between control and treatment group(P>0.05), but were increased significantly than those in the healthy control group(P<0.01). After treatment,the scores of MCTSI and APACHEⅡ,the levels of serum DAO, ET, IFABP were decreased significantly than those before treatment in two groups(P<0.05 or P<0.01), but the scores of MCTSI and APACHEⅡ, the levels of serum DAO, ET and IFABP were decreased significantly than those in the control group(3.78 ± 0.43)vs (5.89 ± 0.13),(5.65 ± 1.77)vs (9.05 ± 1.61),(2.18 ± 0.16)U/ml vs (3.22 ± 0.15)U/ml,(0.15 ± 0.06)EU/ml vs (0.25 ± 0.09)EU/ml,(62.01 ± 12.82)ng/L vs (85.43 ± 16.79)ng/L; all P<0.05). There was a significant positive correlation between serum DAO, ET, IFABP and the scores of MCTSI (P<0.01). There was a significant positive correlation between serum DAO, ET, IFABP and the scores of APACHEⅡ, too (P<0.01). Conclusions Patient with acute pancreatitis have obvious intestinal mucosal barrier injury. Alprostadil injection can improve clinical symptoms and the scores of MCTSI to a certain extent by protecting intestinal mucosal barrier function.