Abstract: The research and processing technologies on tara (Caesalpinia spinosa Kuntze) and tara tannin at home and abroad were reviewed, including botanic peculiarity of tara, utilization and processing of tara bean, chemical composition and its extraction, purification, processing of tara to prepare gallic acid, pyrogallic acid and their utilization, tannage for leather, as well as solid-liquid separation, foam floatation and their reorganizing, coupling technologies. The application and development of tara tannin were prospected.