Objective To observe the curative effect of Dachengqi decoction on severe acute pancreatitis（SAP）.Method 66cases of patients with SAP were randomly divided into control group and experimental group with33cases in each group.Patients in the control group were given routine western treatment while those in the experimental group were treated with traditional chinese dachengqi decoction based on the routine treatment

and curative effects of the two groups were compared.Results Time of pain alleviation in the experimental group was（11±0.5）d and average hospitalization time was（28±1.9）d while time of pain alleviation in the control group was（14±0.6）d and average hospitalization time was（35±2.1）d.Cure rate in patients of the group treated with dachengqi decoction was 91.0% while that of the control group was 75.8%

and differences between the two groups were statistically significant（p<0.05）.Conclusion Routine western treatment combined with dachengqi decoction has significantly better curative effect than routine therapy in treating SAP

so the combination is worth promoting in clinic.