Abstract: Analyzed in the essay are the causes for the low anti-bending strength at the stress point of an engineering tube.And by introducing the mechanics of materials，the mechanical explanation of how does the“bamboo structure”reinforce the anti-bending ability of a tube is explicated.The analysis indicates that by installing a“bamboo structure”in the section of a hollow tube to prevent the stress point from caving in towards the inside of the tube，which may result in early bending and fracture，the anti-bending ability of the tube will be significantly improved.Furthermore，the“bamboo structure”technique can lead to the reduction of the tube wall thickness to 1/3～1/2 of the original one，saving more than 50%of the steel，without compromising the original tube strength.