Fifty cases of acute pancreatitis (AP) were treated with LIYI TANG (Decoction for AP) as the treatment group, and the other 50 cases of the disease with Western drugs as the control group. The results of one-week clinical observation showed that, in the treatment group, 43 cases were cured, 3 markedly effective, 2 improved and 2 ineffective; while in the control group, 32 cases were cured, 5 markedly effective, 4 improved, and 9 ineffective, showing a statistically significant difference in therapeutic effects between the two groups (P < 0.05).