This calibration system table is suitable for value transfer of quality measuring instruments. It stipulates the national quality measurement standards, quality measurement standards and the use of working measuring instruments in the mass unit "kg"; a complete set of basic devices and metrological parameters included in measuring instruments of each accuracy level; and specifies that the national quality standards rely on the quality deputy The procedure for transmitting mass unit values from datum and measuring standard instruments to working measuring instruments gives its uncertainty or maximum allowable error and the basic transfer method. All mass values used in accordance with the law must be within the specified accuracy range and strictly correspond to the mass value of the 1kg mass reference weight (also known as the national kilogram prototype) in a certain determinable ratio. All mass values used in accordance with the law must be traced to the 1kg mass reference weight in accordance with this calibration system.