The creation and transformation of new molecules with the original breakthrough and the prospect of industrial application is the basis of synthetic chemistry. New rare-earth organometallic complexes play crucial roles in synthetic chemistry. The study on the synthesis, structure and transformation of rare-earth metallacyclic complexes is significantly required because they lagged behind those of transition-metal congeners for decades. The synthesis and isolation of these rare-earth organometallic complexes are very challenging due to the facts: i) rare-earth metal-carbon bonds are predominantly ionic; ii) rare-earth metal ions have various coordination numbers; iii) the coordination geometry of rare-earth metal ions is less regular and predictable than that of d-block metal ions; and iv) rare-earth organometallic complexes easily undergo ligand redistribution. Our group will mainly focus on two aspects: