To treat with shell of crawfish properly, preparation of glucosamine hydrochloride from the shell of shrimp was studied in this paper. The shell of shrimp was boiled by 5% NaOH for 1.5h, then submerged in 5% HC1 for lh,0. 5% KMnO4 for 0. 5h, to get chitin product. The chitin was hydrolyzed with hydrochloride at 80 to 95℃ for 3 to 4h to produce glucosamine hydrochloride. The products were characterized by infrared spectra, differential scanning calorimetry analysis and element analysis. The re...