Abstract: Liquid phase diffusion welding of GH4413 alloy was carried out and BNi-2 was used as filler material. The microstructure, composition distribution and microhardness of the welded joint were researched under different welding parameters. Welding temperature was respectively 1030 ^\circ \mathrmC and 1080^\circ \mathrmC, and heat preservation time was respectively 30 min and 60 min . The results of scanning electron microscopy (SEM) and energy spectrum analysis show that, when welding temperature was 1080 ^\circ \mathrmC, and heat preservation time was 60 min, the solid solution with good performance formed in brazing seam. In addition, the width of brazing seam increased, the diffusion depth of brazing filler metal's elements to base metal increased gradually and intermetallic compounds formed near seam section of base metal with the increase of welding temperature and heat preservation time.