目的　探讨原发性腹膜后脂肪肉瘤复发的机理及预后。方法　复习原发性腹膜后脂肪肉瘤临床资料及文献 ,总结伴有亚型转化的原发性腹膜后脂肪肉瘤患者的生存时间及复发率。结果　伴有亚型转化的患者平均复发次数高于非亚型转化患者 ,但生存时间较长。结论　亚型转化使腹膜后脂肪肉瘤的复发次数增加而不影响生存期 Objective To investigate the mechanism and prognosis of primary retroperitoneal liposarcoma recurrence. Methods The clinical data and literature of primary retroperitoneal liposarcoma were reviewed. The survival time and recurrence rate of primary retroperitoneal liposarcoma patients with subtypes were analyzed. Results The average number of recurrences with subtypes was higher in patients with non-subtype transformation than in those with subtypes, but the survival time was longer. CONCLUSIONS Subtype transformation increases the number of retroperitoneal liposarcoma recurrences without affecting survival