Abstract: Samples for interface morphology observing were collected in the titanium-steel cladding transition, and the distribution and diffusibility of component in titanium-steel interface were analyzed.The test results indicated that molten metal existed in titanium-steel interface, and the layer of molten metal was extremely thin, with a thickness about 0.3 μm.Nanocry stalline and the amorphous mixed organization also exists in titanium-steel interface, and pervasion of Fe and Ti elements pervaded in and around the titanium-steel interface.