Abstract: Under high-strain-rate conditions, Ti and steel in Ti-steel clad plate deformed, with the deformation compatibility mechanism playing a key role at the bonding interface. The interfacial microstructure and deformation mechanism of Ti-steel clad plate under high strain were investigated in this paper. The results show that, for the steel side, with increasing strain rate, the number of small-angle (3°-10°) grain boundaries increases and texture component 112 〈241〉gradually evolves into textures 665 〈386〉 and 111 〈110〉. For the Ti side, with increasing strain rate, deformation twins appear. Different deformation twins such as tensile twin 1121 〈1100〉, compression twin 1122 〈1123〉, and tensile twin 1012 〈1011〉are produced. The deformation mechanism of the Ti side at high strain rate transforms from a conventional"twin deformation"mode to the compound deformation mode"coexistence of dislocation slip and twin deformation. "With the increase of strain rate, the bonding interface would coordinate the different deformation resistances of both sides, to achieve a continuous deformation without any materials damage. The main coordination mechanism relies on the bonding interface and the slip of adjacent grains.