DED (Direct Energy Deposition) technology is being advanced for the repair and reinforcement of components.　 However, depending on the metal material used, voids or cracks may occur in the formed metal layer, posing problems.　 For example, cemented carbide is a useful material for partial reinforcement due to its wear resistance.　 However, since it is a composite material of WC and Co, the occurrence of cracks is a concern.　 To suppress the occurrence of cracks, it is important to mitigate thermal stress.　 Therefore, in this study, in addition to the laser beam used to form the metal layer, we attempted a method of suppressing thermal deformation by providing a laser beam to heat the substrate.　In the metal material, we used WC-12mass%Co.　 The laser beam for heating the substrate was irradiated at a distance of 0.1mm to 0.5mm away from the cladding area, and its effectiveness was verified.　 We also investigated the effects of differences in laser output.　 After the experiment, we confirmed the portion where the metal layer was formed using an optical microscope and investigated the number of cracks.　Based on the experiment results, we confirmed that cracks can be suppressed compared to when the laser beam for substrate heating is not used.