Along with the coastal region petrochemical, electric power industry is developing rapidly, the application of seawater to replace increasingly scarce fresh water as cooling medium can save a large amount of freshwater resources. But because seawater containing corrosive chloride ions, when the bundle (mainly heat exchange tube ) uses the ordinary carbon steel or stainless steel will cause serious corrosion, reduce the service life of the heat exchanger. The relatively low cost of carbon steel, stainless steel as base and corrosion resistance of the thin titanium tube composite tube heat exchanger is solved at the same time requiring high corrosion resistance and reduce the equipment cost two kinds of functions. This patent as heat transfer equipment because of its ideal corrosion resistance, relatively low manufacturing cost and the service life is long advantage has great market demand, investment in the production of such products can create a good social and economic benefits. Because of the composite tube heat exchanger with very high price, and has excellent corrosion resistance and low cost advantages, in the domestic, international petrochemical plants in the very broad application prospects