The pulsed Nd:YAG laser cladding is one of the most effective methods of the precise repairing technology. It is decided by the voltage, electric current, pulse length, pulse frequency, scanning speed and beam diameter of the Nd:YAG laser. In order to fully consider the effect of these processing parameters and simply the adjustment processing parameters, spot overlap rate definition is referred. And the calculation equation of spot overlap rate is formulated. The experiment was carried out with precoated layer and wire feeding laser cladding repairing. The clad layers are found perfectly at single pulsed energy of 6.7 J and spot overlap rate of 97.4%. Different kinds of defects produced by wire feeding laser cladding are observed by SEM. The reasons of producing defects are preliminarily probed.