Laser repair of GH4169 alloy which is commonly used in aero engines by usage of the nickel-based superalloy FGH95 powder is tested. The high-temperature tensile properties of the repaired sample with different process parameters are investigated and the fracture mechanism is also analyzed. The results show that, with appropriate process parameters, the high-temperature tensile strength of the repaired samples can be recovered up to more than 85% of that of the intact samples. When the laser linear energy density is 100 J/mm2, the maximum high-temperature tensile strength is 708 MPa, which is 90.4% of that of the intact sample and the maximum yield strength is 538 MPa, which exceeds 4.3% of that of the intact sample. The fractions of the repaired samples occur at the substrate heat-affected zone, where the segregation of elements is induced by the alternating heat action of laser scanning. This segregation is the main reason for the degradation of the high-temperature tensile property of the repaired samples.