A symmetry assembled slab of steel/titanium/separating agent/titanium/steel was designed for fabricating titanium clad steel by hot roll bonding. Effect of heating temperature on microstructure, strength-toughness and bonding properties of clad steel plates were investigated at condition of 850-1000℃. The results show that with the increase of temperature, the shear strength decreases obviously. The heating temperature has an important effect on the variety and thickness of interfacial phase. At temperature of 850, 875 and 900℃, carbon can easily diffuse to the bonding interface to form the TiC layer at the cooling process of roll bonding. The TiC plays an role of barrier to hinder the diffusion of iron into titanium. Consequently, TiC and β-Ti are formed at the Ti/steel interface. While at temperature of 950 and 1000℃, carbon can not enrich at the Fe/Ti interface owing to that the diffusion coefficient of C in β-Ti is over 10 times bigger than that of C in γ-Fe. Therefore, iron can diffuse sufficiently into titanium to form the interface products consisted of Fe-Ti intermetallic compounds, TiC, β-Ti and α-β Ti. In addition, the increase of heating temperature promotes the rise of brittle phase layer thickness. The reduction of shear strength is attributed to the increase of variety and thickness of brittle phase.