The heat pipe is extremely used in many fields for that the efficiency of heat transfer characteristics in heat pipe exchanger.In this paper the three different shapes of heat transfer is calculated by fluent and research the mixture of the heat pipe of triangular and square in the heat exchanger of heat pipe.Then comparing the effect of heat transfer between them.The result show:The transfer coefficients of round heat pipe nearly obey parabolic which from the previously to the rear.The transfer coefficients of triangular heat pipe maintain hi...