Abstract:【Objective】 To explore the effect of early fluid resuscitation on the prognosis of patients with severe acute pancreatitis (SAP). 【Methods】 The 78 SAP patients who received treatment in our hospital from Mar. 2011 to Mar. 2014 were selected for the study. They were divided into observation group and control group with 39 cases in each group. The patients in the control group were treated with routine comprehensive treatment and those in the observation group were given early fluid resuscitation on the basis of comprehensive treatment. The incidence of complications and mortality were compared between both groups after treatment. 【Results】 After one-week treatment, Ranson score, APACHE II score and CTSI score of the observation group were (3.2 ± 1.2), (9.2 ± 2.6) and (4.3 ± 1.5) points respectively, and were significantly lower than those of the control group [(3.8 ± 1.5), (10.4 ± 2.1) and (5.1 ± 1.7) points; P < 0.05]. Mortality rate of the observation group was 15.38% which was significantly lower than that of the control group (35.90%, P < 0.05). In the observation group, the cumulative fluid balance continued to grow in the death group after three-day treatment, but it began to stop growing in the improved group. 【Conclusions】 Early fluid resuscitation can reduce mortality of patients with SAP. The SAP patients who show a negative fluid equilibrium in early stage have a better prognosis.