At present, there are MBIO index, Platts index and TSI index abroad to measure the price of iron ore. China iron ore price index (CIOPI) consists of two sub-indices: domestic iron ore price index and imported iron ore price index, both of which are based on the April price of 1994 (100). Among them, the domestic iron ore price index data is the tax-included price of iron concentrate market in the main producing areas of China, including 14 dry-basis iron concentrate prices in provinces, autonomous regions and municipalities and 32 mining areas; The price index data of imported iron ore is the CIF price of dry powder ore submitted by the member units of China Steel Association, and finally weighted with reference to the transaction price of imported iron ore in domestic ports.