Objective To discuss the clinicopathological characteristics of retroperitoneal tumors(RPT), and summarize the experience of diagnosis and treatment. Methods We reviewed and analyzed the data of 687 RPT patients between September 1975 to December 2014. Results RPT pathological type was complex: benign tumour: 173 cases, low-grade malignant tumor:44 cases, and malignant tumor: 470 cases. The common primary malignant RPT was liposarcoma(11.6%), leiomyosarcoma(8.7%), malignant fibrous histiocytoma(4.4%). Tumor...