This calibration system table is suitable for value transfer of quality measuring instruments. The calibration system table stipulates the national quality measurement benchmarks, quality measurement standards and working measuring instruments for the mass unit "kg"; a complete set of basic devices and metrological parameters included in each accuracy level measuring instrument; and indicates that the national quality standards rely on The procedure for transmitting the mass unit value from the quality sub-reference group and the standard measuring instrument to the working measuring instrument gives its uncertainty or maximum allowable error and the basic transmission method. During the actual use of this calibration system table, the nominal values of mass measurement standard weights and working weights can be expanded upward or downward within the corresponding accuracy level as needed. 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 1 kg 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 1 kg mass reference weight in accordance with this calibration system table; when performing calibration, it can also be used as the basis for traceability of the quantity value.