Abstract: In this study, within the transition layer of aluminum plate, Ti/Al/Mg explosion cladded plate were well fabricated by explosive welding. The Ti/Al, Al/Mg bonding interface and the whole Ti/Al/Mg composite plate’s mechanical properties were investigated. The OM and SEM result revealed that both bonding interface of Ti/Al and Al/Mg interface show periodic wave morphology, and partial melting zone was appeared in the Al/Mg bonding interface. The interface wave sizes of Ti/Al interface wave show a small size with 160 μm in amplitude and 26 μm in wavelength, and the Al/Mg interface wave presents a large size, measured the length of 1 740 μm and the mean amplitude of 406 μm. The fracture position after tensileshear testing test was along Al/Mg bonding interface. The threepoint bending testing strength of Ti/Al/Mg composite plate was found to be higher under the condition of Mg alloy layer in pressure, and the crack propagation begins at the Al/Mg bonding interface and then fracture failure at the base metal magnesium alloy plate.