Ruled surfaces obtained from dual NURBS curves are widely used in complex parts in various industries.How to realize additive manufacturing of complex ruled surfaces has always been a problem of great concern in the additive manufacturing field.The blade model was described by dual NURBS curves,and the ruled surface was further obtained.By optimizing the process parameters,the additive manufacturing of impeller blades was realized by GMAW method.The blades obtained by additive manufacturing are complete and well formed,which shows that it is feasible to realize the additive manufacturing of dual NURBS curve blades by GMAW process.This study provides a new method for blade model construction and GMAW additive manufacturing of complex shape blades,and has reference significance for additive manufacturing process control of complex shape parts.