  An inertial mass measurement project, which is expected to precisely measure
the Planck constant, $h$, for possible comparisons with known gravitational
mass measurement projects, e.g., the watt balance and the Avogadro project, is
being carried out at the National Institute of Metrology, China. The principle,
apparatus, and experimental investigations of the inertial mass measurement are
presented. The prototype of the experiment and the Planck constant with
relative uncertainty of several parts in $10^{4}$ have been achieved for
principle testing.
