To study the explosive welding of metal plates with larger different melting point and strength, the experiment used aluminum plate with dimension of 5 mm×300 mm×300 mm and steel plate of dovetail groove with dimension of 28 mm×300 mm×300 mm were used as flyer plate and base plate, respectively. The explosive material used in explosive welding was an emulsion explosive which was in aluminum honeycomb panel. Explosive welding parameters were selected by theoretical formulas, which made the inner surface aluminum plate come into being metal jet, and the inner surface of steel plate merely form plastic deformation. Results show that aluminum plate and steel plate of dovetail groove are welded together relying on combined action of metallurgical bonding, and extraction and meshing of dovetail grooves, which can save more explosives than those of traditional aluminum-steel explosive welding by over 31%, and reduce the lower limit of explosive welding window of aluminum and steel clad plate. Interface of the explosive clad plate is combined closely, whose combined area is 141 percent bigger than that of traditional aluminum-steel explosive clad plate, and whose shear strength are higher than 79 MPa, then mechanical properties of the explosive cladding plate meet the requirements of bonding strength of aluminum alloy-steel clad plate.