Herba Hedyotis Diffusae polysaccharides are the multiple plant active ingredients such as antitumor and antibacterial. At present, its extraction includes ultrasonic wave extracting, microwave extracting and hot water extracting etc.. In addition, its purification is mainly reflected in the deproteinization and depigmentation. This paper summarized the domestic progress on extraction and purification techniques for Herba Hedyotis Diffusae polys...