Abstract: In order to solve the problem that the intermetallic compound generated during the hot rolling of the titanium steel composite plate reduces the shear strength of the composite plate, the method of interface microstructure regulation was adopted, and the interfacial microstructure of TA2 was modified by Ga element.The results show that after modification with Ga element, the titanium side structure of the composite plate after hot rolling is stable to α-Ti.A single TiC layer is formed at the bonding interface of the composite plate, and the thickness of the TiC layer is 190, 180 and 510 nm at rolling temperatures of 850, 900 and 950 ℃, respectively.When the rolling temperature is 900 ℃, the shear strength of the composite plate is 235 MPa. While increasing the rolling temperature of the titanium steel composite plate and reducing the load on the rolling equipment, it can also ensure the shear strength of the titanium steel composite plate.