Strength and plasticity of laser deposition repair GH4169 alloy reach only the casting standard Q/5B 453- 1995. Heat treatment is an important method to improve the mechanical property. The effects of heat treatment on the microstructure and mechanical properties of laser deposition repair GH4169 alloy are investigated. As compared with as-deposited (AD) samples, after the direct aged (DA) heat treatment for laser deposition repair GH4169 alloy, the interdendritic Laves phase is slightly dissolved, the tensile strength of DA samples increase obviously, equaling to the wrought standard of Q/3B548-1996 at room temperature, however, the plasticity of DA samples decreases slightly. The strength and plasticity of DA samples is not improved when prolonging aged time. The solution heat treatment results in further dissolution of Laves phase and precipitation of a large number of needle d phase around it, the tensile strength of the solution samples reach the wrought standard, the elongation after fracture increase by 21% compared with as- deposited samples. The homogenization heat treatment results in almost entirely dissolution of Laves phase, and the d phase is precipitated in the grain and grain boundary, the tensile strength of the homogenization samples is roughly equivalent to the wrought standard, the elongation after fracture surpassed the wrought standard by 27.1%. The results show that the strength and plasticity of laser deposition repair GH4169 alloy can be effectively improved by the suitable heat treatment.