The categories of chemical reagents are basically divided according to their use or discipline, and many new categories were added abroad in the eighties. The German company E. Merck is divided into 20 categories and 88 sub-categories. J.T. Baker has 75 categories and 124 sub-categories. With the development of science and technology, the varieties of chemical reagents are becoming more and more diverse, and the trend of category division is becoming more and more detailed, and the varieties are serialized and matched.