Carapace cellulose is a kind of rime or amorphism with no color, smell or toxin and free from sunshine, heat and moths. It enjoys many natural advantages, such as anti-bacteria, degradable, toxin-free, easy absorbing, and ulceration-prevention. These exists the 15-20De acetyl-amido glucose chain in the molecule of natural carapace cellulose, which can be processed by chemical means and mixed to produce the carapace/viscose man-made fiber by traditional spinning process when dissolved into rare alkali liquor together with xanthate natrium. Beside the features of traditional viscose fibers, this kind of fiber also enjoys the following spectacular performance: 1.The fiber features little thrill, good moisture containing, softness, degradable and can prevent proliferation of bacteria, so these features as well as its various functions make it more suitable for underwear and other garments. 2. The fiber can effectively prevent bacteria and epiphyte people may meet in their daily life. The improved fiber possesses the tenuous hole structure with the same effect as capillary, which can help expel the perspiration to prevent for bacteria from growing. 3. The fiber becomes easier to be dyed. The modification molecule with positive charge in the rare acid liquor can help improve the speed and fastness during dyeing proceed because of the negative ion in the dyestuff. Meanwhile, the color fastness against sunshine and washing of the fabric is improved, too. 4. The fabrics made thereof will perform better in regards of anti-crease characteristic, because the modification molecule helps increase the intensity of the fiber.