Cinnamomum cassia Presl has high medical value because it contains plenty of physiologically-active components,including Cinnamomum cassia Presl essential oil,oleoresin,flavonoid,polysaccharide,polyphenols,inorganic ions,etc.Conclude and discuss the health functions,natural active components,extraction and determination of Cinnamomum cassia Presl.Provide theoretical basis for research and development of Cinnamomum cassia Presl in food and medicine.