Abstract: The numerical and experimental study was carried out for the discrete double-inclined ribs (DDIR) tube developed on the basis of the convective heat transfer field-coordination theory. The experimentally fitted relationships of heat transfer and resistance coefficients were given. The periodical change of the original surface specially designed in the DDIR tube induced multi-longitudinal vortex flow and enhanced heat transfer remarkably with less extra flow resistance.When Re=500—2300,heat transfer enhancement of the DDIR tube would be increased by 2.5—6.5 times with a resistance increase of 120%—300% compared to the laminar heat transfer of a circular tube (L/D=300) considering inlet effect. When Re=2300—10⁴,heat transfer enhancement would be increased by 130%—240% with a resistance increase of 130%—220%.When Re=10⁴—5×10⁴,heat transfer enhancement would be increased by 110%—130% with a resistance increase of 220%—240% compared to the circular tube.There was no flow dead zone in the DDIR tube so fouling could be prevented in the tube.Its manufacture could be more efficient and low-cost, therefore it is a kind of heat transfer enhancement tube with excellent overall performance.