Phosphine ligands are a type of ligand commonly used in metal coordination chemistry and are widely used in catalytic reactions, metal organic chemistry and organic synthesis. Phosphine ligands have unique electronic properties and can form stable coordination complexes with metal centers, so they play an important role in many metal catalytic reactions. Phosphine ligands widely affect the activity, stability and selectivity of metal catalysts through their unique electron donation properties and steric effects. In catalytic reactions, phosphine ligands can not only stabilize metal catalysts and enhance the selectivity of reactions, but also play an important role in redox reactions. Therefore, phosphine ligands play a very important role in metal catalytic reactions and organic synthesis.