Abstract：Redefinition of the International System of Units ( SI) on the basis of fundamental physical constants is hot issue for metrologists. However some constants determination does not meet the required uncertainty. The research of quantum mass standard is the emphasis and difficult points in the metrology especially. After 30 years developments, the silicon sphere method and the watt balance method have been made significant progress. Nevertheless, the published results still have a magnitude of deviation about 10-7. Two popular approaches on quantum mass standard are made a detailed comparison，it is found that whether Planck constant h or Avogadro constant NA , there would be a long road to explore to eliminate the last artifact unit and it would be inappropriate time to substitute for international prototype kilogram at the present stage.
李辰,韩冰,贺青,张钟华,李正坤. 实现质量量子基准的两种途径[J]. 计量学报, 2014, 35(5): 517-520.
LI Chen,HAN Bing, HE Qing,ZHANG Zhong-hua,LI Zheng-kun. Two Approaches on Quantum Mass Standard. Acta Metrologica Sinica, 2014, 35(5): 517-520.
韩冰，贺青，李世松，等.普朗克常数则定与质量量 子基准的最新研究进展[J ].计量学报，2013，34 (1): 90-96.
 Girard G. The third periodic verification of national prototypes of the kilogram ( 1988 ~ 1992 ) [ J ]. Metrologia, 1994, 31(1) ： 317 - 336.
 张钟华.量子计量基准的现状[J].仪器仪表学报， 2011, 32(1) ： 2-5.
 Kibble B P. A measurement of the gyromagnetic ratio of the proton by the strong field method. In ： Sanders J H, Wapstra A H. Atomic Masses and Fundamental Constants 5[M]. New York： Springer, 1976.
 Steiner R L, Williams E R, Liu R, et al. Uncertainty improvements of the NIST electronic kilogram [ J ]. IEEE Transactions on Instrumentation and Measurement, 2007 , 56(2) ：592 - 596.
 Robinson I A, Kibble B P. An initial measurement of Planck’s constant using the NPL Mark II watt balance [J].Meiro/o^a,2007,44(6) ：427 - 440.
 Eichenberger A L, Baumann H, Jeanneret B. Determination of the Planck constant with the MET AS watt balance [ J ]. Metrologia ,20\ 1,48 (3) ： 133 - 141.