Ubiquitin-ribosomal protein S27a(UBRPS27a) is a fusion protein of Ubiquitin and ribosomal protein. The N-terminal is ubiquitin and C-termina is ribosomal protein S27a with a high conservative zinc finger domain of the C2-C2 type. When it was expressed in eukaryotes，The intact fusion protein were rapidly processed to free ubiquitin monomer and ribosomal protein S27a(RPS27a). Ubiquitin degradated proteins particularly and selectively in cell and RPS27a is indispensable for translation. This multifunctional ribosomal protein is expressed at high levels in a wide variety of actively proliferating cells and tumor tissues and is a representative characteristic of various tumor cells. In our preliminary study of this protein in the silkworm，RPS27a also be found express highly in actively proliferating cells. The precise functional role of each ribosomal protein is largely unknown and many ribosomal proteins have extraribosomal functions apart from the particle. In this article，we review the recent research on the connection between tumor and this fusion protein，Ubiquitin-Proteasome Pathway and ribosomal protein. These research may indicate the origin and development of tumor，provide the basis for clinical diagnosis of cancer and the novel therapeutic targets for the treatment of malignant tumors.