Abstract: The round hole defect of ZTC4 plate is repaired by coaxial powder feeding laser cladding technology. Laser cladding is studied under different processes,different scanning paths and different heat treatment processes by means of edge bonding and rotating overlap.The effect of repair on the mechanical properties of ZTC4 repair parts. The results show that the repair quality and repair efficiency of the edge-sealing and rotating overlap are similar,and a certain repair quality can be guaranteed while ensuring the repair efficiency. The spot diameter is a process parameter that is more important to the quality of the repair than the number of repair layers. When the deep 3 mm and 5 mm holes were edge-sealed and rotated,it was found that the mechanical properties obtained by the edge-bonding process withφ2. 5 mm spot diameter were better than the spot diameter φ1. 0 mm edge-sealing and rotation repair process. The spot diameter φ2. 5 mm lap joint tensile test results in ductile fracture; the spot diameter φ1. 0 mm edge lap joint tensile results are quasi-cleavage fracture.At the same time,the comprehensive mechanical properties of the repaired samples did not change much before and after solution treatment and solution treatment.