Abstract: After surface cleaning,weld combining and vacuumizing to 1×10^-3 Pa,Q345 continuous casting slabs were processed by conventional control rolling(CCR) and recrystallization control rolling(RCR).The mechanical properties of the clad rolling plates were tested by shear,tensile and cold bending tests,and the microstructures and combining boundaries were observed by scanning electron microscope(SEM).The results show that the mechanical properties of the clad rolling plates produced by the two rolling processes are all qualified.Compared with CCR process,RCR process provides a better bonding effect and the plate has better property homogeneity in the thickness direction.The clad rolling process in the experimental condition involves the mechanical meshing mechanism and the recrystallization mechanism.