Abstract:Functional oligosaccharides have attracted the interest of researchers in China and abroad owing to the outstanding physiological characteristics，and the development and utilization has become a research hotspot in recent years.In this study，the types，sources，and functional characteristics of several common functional oligosaccharides were summarized.The biological effects in animal feed，crops，food，and medicine，and the main preparation methods，characteristics，and applications were reviewed.Furthermore，the development prospect of them was summarized.This study was expected to provide theoretical reference for further study and broadening the application of functional oligosaccharides.