80% human diseases are disorders and immune function degradation and related, 80% of deaths are related to immune collapse and end. Chitosan oligosaccharide enters the human body, the formation of cationic groups, and human cells have affinity, can improve the human immunity through multiple pathways of cellular immunity, humoral immunity and nonspecific immunity. At the same time, chitosan oligosaccharide can direct role in the human central immune organ hematopoietic stem cells, the immune cells in the differentiation process of increase in the number, improve the quality of and fundamentally regulate the body's immune function.