Graphene is widely used to reinforce metal matrix composites due to its excellent physical and mechanical properties. However, its poor interfacial wettability and dispersion problems in copper-based brazing filler metals still limit its application effect.This study explored the influence of graphene on the sintering behavior and structural properties of copper nanoparticles under different doping conditions through molecular dynamics simulation combined with experimental methods. The results show that an appropriate amount of well-dispersed graphene helps promote the densification process and improve the structural stability, while graphene in the agglomerated state may have an adverse effect on the mechanical properties. This work provides theoretical support and experimental basis for optimizing the application of graphene in copper-based brazing metals.