Objective To improve the safety and decrease the blood loss during resection of retroperitoneal tumour (RRT).[WT5”HZ]Method [WT5”BZ]We analysed retrospectively 54 patients whose blood loss were over 3?000?ml during RRT in our hospital from 1983 to 1998.The blood loss was over 5?000?ml each in 22 patients,and over 8?000?ml each in 7 patients, the maximum blood loss was 10?000?ml.[WT5”HZ]Result [WT5”BZ]Among the 54 patients whose blood loss were over 3?000?ml and up during RRT, 17 sank into shock and 2 of them died.[WT5”HZ]Conclusion [WT5”BZ]The preoperative evaluation and preparation are important to operative safety.We emphasize intraoperative management of massive bleeding during RRT.