Abstract: The additive manufacturing was carried out on GH4169 base material test block by using laser deposition process and GH4169 powder. The double aging heat treatment was carried out for the test blocks. The high temperature endurance test and low cycle fatigue test were carried out, and the properties of the test blocks were analyzed. The results show that the microstructure of the additive region is dendrite morphology, and there are different angles between the dendrites.Under 650 ℃and 700 MPa, the endurance properties of the sample in the deposition direction achieve the standard of the forging in aging state. The high temperature endurance fracture mechanism is that: cavities are formed preferentially between different dendrites and grow up, then connect with each other to form cracks under the action of continuous tensile stress, and there is local cracking along the crystal, which is the ductile fracture mode of transgranular and intergranular types.Under 455℃, the low cycle fatigue property is close to the 8000 times requirement of forging standard in aging state. The fatigue cracks originate from surface or near surface pores, and there are cleavage steps and radial lines in the crack propagation zone, accompanied by fatigue bands, and the cracks locally propagate along the slip bands.The transient fracture zone is a typical dimple transgranular fracture.