Due to the rapid development of modern medicine, cell biology, and molecular biology, people have a deeper and deeper understanding of the immune system. Immune system disorders can lead to human aging and various diseases. The immunomodulatory effects of polysaccharides are mainly accomplished by activating macrophages, T and B lymphocytes, reticuloendothelial system, complement and promoting the production of interferons and interleukins. Studies have shown that jujube polysaccharides can increase, bamboo leaf polysaccharides, Gynostemma pentaphyllum polysaccharides, cordyceps polysaccharides, black soybean crude polysaccharides, fig polysaccharides, hericium edulis polysaccharides, Chinese kiwi fruit polysaccharides, atractylodes polysaccharides, parsnip polysaccharides, rehmannia glutinosa polysaccharides, medlar polysaccharides, helix Algae polysaccharides, Eucommia ulmoides polysaccharides, Ligustrum lucidum polysaccharides, etc. all have the function of improving the body's immunity. Among the fungus plant polysaccharides, Yunzhi polysaccharide, Ganoderma lucidum polysaccharide, Poria polysaccharide, Tremella polysaccharide, and lentinan have been used clinically to enhance cellular immune function.