Holmium chloride is an inorganic compound with a metallic luster yellow solid form, a high melting point, and a relatively high boiling point. It shows certain photosensitivity and thermal stability in chemical properties. Holmium chloride has a wide range of applications in several fields, first, it can be used to make other metal chlorides, such as erbium chloride, ytterbium chloride, etc., these compounds have important roles in optics, electronics and catalysis. Secondly, holmium chloride itself can also be used as a catalyst for chemical reactions such as the synthesis of methanol and olefin. In addition, holmium chloride can also be used to prepare phosphors, pigments and dyes. With the continuous development of science and technology, the application prospect of holmium chloride will be broader.