Objective To discuss and improve the scheme of circulating fluid replacement in the polyuria stage after simultaneous islet cell-renal transplantation.Methods Nursing data of 26 patients after simultaneous islet cell-renal transplantation during the polyuria stage were analyzed retrospectively,the impact on spend-and-tax circulating fluid replacement on the outcome after surgery was observed.Results In 26 patients,3 case suffered graft function recovery delay,23 patients' renal function recovered smoothly without water-electrolyte and acid base disorders in period of diuresis,compared with the 16 cases with traditional fluid replacement in the same time,serum creatinine (SCr),blood urea nitrogen (BUN) and blood glucose (BG) decreased significantly in 72 h.Conclusions Using spend-and-tax fluid replacement can reduce postoperative complications such as water-electrolyte and acid-base disorders in simultaneous islet cell-renal transplantation patients,and promote the functional recovery of transplanted islet cells and kidney.