Abstract: GH4169 superalloy was prepared on the 1Cr18Ni9Ti stainless steel substrate by using electromagnetic assisted TIG wire arc additive manufacturing (WAAM). The solidification microstructure of GH4169 nickel-based superalloy was discussed, and the effect of excitation current on the room temperature fatigue property of the GH4169 alloy was investigated.The results show that the microstructure of GH4169 superalloy fabricated by electromagnetic assisted WAAM is dense, without obvious defects such as pores and cracks.The microstructure of the specimen is composed of coarse columnar grains along the deposition direction from bottom to top. After application of external electromagnetic field, the size of columnar grain decreases and when the excitation current is 1 A, the content of brittle Laves phase between dendrites is the minimum, and the element microsegregation is weakened.The fatigue performance of the specimen at room temperature increases firstly and then decreases with the increase of the excitation current. When the excitation current is 1 A, the fatigue life of the specimen reaches 1.1×10⁶, and the fatigue performance of the specimen at room temperature is the best.