An experimental study was carried out to investigate the thermal performance of a new type of copper wire-bonded flat heat pipe.The influences of working fluid，steam temperature，wire diameter and wire gap on the thermal performance of the heat pipe were investigated to design the optimal construction.Experimental results showed that wire diameter had an important effect on heat transfer but hardly had any impact on maximum heat flux.The wire gap not only had an important effect on heat transfer but also had a significant impact on maximum heat flux.