The structure of leading edge embedded high temperature heat-pipe (HTHP) is considered as thermal protection system to prevent hypersonic vehicle's leading edge that requires sharp figure during hypersonic flying from the serious aerodynamic heating. Under the complex flow and heat transfer condition of the heat pipe, the model of leading edge embedded HTHP is established. In contrast with experimental results, the model of heat pipe which is a core component of leading edge embedded HTHP has good accuracy. Using a numerical method, we analyze the thermal protection effect of leading edge embedded HTHP under the given condition. The maximum temperature of leading edge can be decreased by 11.6% and the minimum temperature of the leading edge increases by 8%. Both high temperature areas and low temperature areas are closed in the outer zone of the leading edge. While the temperature distribution of the inner zone is almost uniform, the heat transfer from high temperature areas to low areas is achieved. Thus the thermal load in high temperature areas is reduced. The influence of contact thermal resistance on the thermal protection effect of heat-pipe cooled leading edge is also studied.