In order to improve the cladding quality and to control the bonding interface of the layer formed by overlapping laser cladding,the effects of parameters on the microstructure of bonding interface were studied. The results show that when scanning speed, powder feeding rate and laser power change in the range of 100-250 mm/min,6-7.5 g/min and 1 500-2 500 W, respectively, the bonding region does not appear a white layer and presents different morphologies. One of morphologies is the continuous epitaxial growth with inherited microstructures and directions, and the other is discontinuous epitaxial growth. This is related to the effects of parameters on the depth of remelting region of a shifted dendrite, the orientation and molten degree of grain of a prior layer surface, and the con-vection in the molten pool.