our company is offering three main kinds of chitosans widely used in many fields,expecially in healthy fields. chitosan ,extracted form shrimps and activates immune system (spontaneous healing power),is unsolved in water but can be absorbed in body ,reducing heavy metal,without virulent. carboxymethyl chitosan is the higher derivation of chitosan ,entirely 100%soluted in waterand can strongly absorb the heavy metal. chitosan oligosaccharide has some special functions and characters, including good aqueous solublity,moisture absoption,and antibiosis and so on.oligosaccharide plays a remarkable role in the liver function control preventing growth of alcoholic hepatosis. different industrials have different requirements to chitosan,as in functional material field,in light textile field, in feedstuff additive, in agriculture field, in environment protection field.