Abstract: The structure and characteristics of single-groove heat pipe are introduced. Studies on single-groove heat pipe during the past ten y e ars in China are reviewed. The single-groove heat pipe and normal axial-groov e heat pipe are compared with each other on their heat transfer capacity. Based o n the experimental results, the V-shape groove in the vapor channel is optimize d, and methods to decrease temperature difference and fluctuation are achieved. Subject Term Heat pipe Heat transfer Temperature gradient Experi mentation Research