Hello, the formation method of the central parity of RMB against the US dollar is as follows: China Foreign Exchange Trading Center makes an inquiry to all market makers in the inter-bank foreign exchange market every day before the opening of the inter-bank foreign exchange market, and takes all market makers' quotations as calculation samples of the central parity of RMB against the US dollar. After excluding the highest quotation and the lowest quotation, the remaining market makers' quotations are weighted and averaged to get the central parity of RMB against the US dollar on that day, and the weight is comprehensively determined by China Foreign Exchange Trading Center according to the trading volume and quotations of the quotations in the inter-bank foreign exchange market. The central parity of RMB against Euro, Japanese Yen and Hong Kong Dollar is calculated and determined by China Foreign Exchange Trading Center according to the central parity of RMB against US Dollar on that day and the exchange rates of Euro, Japanese Yen and Hong Kong Dollar against US Dollar in the international foreign exchange market at 9: 00 am. Calculation of the central parity of RMB exchange rate: the highest hourly price+the lowest hourly price /2