Abstract: For joining molybdenum/stainless steel dissimilar materials,two kinds of brazing filler metal and welding parameter suitable for which were determined. The brazed rate was very good,which could reach more than 85%. The technology and equipment for welding of support seat and support seat to molybdenum tube were designed and manufactured,which realized functions of support compaction,deformation and quality control and uniform temperature compensation,and which guaranteed welding requirements of products. Heat treatment test of parts and process equipment was carried out to avoid influence of residual stress in the component manufacturing process on welding quality. The ion source accelerator product was manufactured. Vacuum leakage rate was less than 1×10^-7 Pa·L/s. Brazing seam had no leakage under water pressure detection with 2 MPa and 14 molybdenum tubes were detected without clogging inside,which met requirements of the design index.