Abstract: The review is about research progress of HIV coreceptor-chemokine receptor,especially about tropism,fine definition of a conserved CCR5-and CXCR4-binding region on the human immunodeficiency virus type 1 glycoprotein 120,the function of CXCR4 and CCR5 on viral entry.In addition to CD4,the human immunodeficiency virus (HIV) requires a coreceptor for entry into target cells.The two primary kinds of coreceptors are CXCR4 and CCR5.The chemokine receptors CXCR4 and CCR5,members of the G protein-coupled receptor superfamily,have been identified as the principal coreceptors for T cell line-tropic and macrophage-tropic HIV-1 isolates,respectively.Beyond providing new perspectives on fundamental aspects of HIV-1 transmission and pathogenesis,the coreceptors suggest new avenues for developing novel therapeutic and preventative strategies to combat the AIDS epidemic.