Absorption behaviors of Beta-chitin in alkali solution under different treatment conditions of concentration, soaking time and temperature, ratio of Beta-chitin to alkali solution were analyzed. The solid state structural changes of the resulting chitin were inverstigated by X-ray diffraction, FT-IR spectroscopy, SEM and UV-VIS spectroscopy. The results showed that the absorbency increased as temperature decreased or alkali concentration increased. Maximum absorbency and establish of Beta-chitin were achieved at - 40oC with a NaOH 4M solution and the ratio 1:75 (g/ml) after soaking 4 hours.