  We propose a new quantity which describes the confinement-deconfinement
transition based on topological properties of QCD. The quantity which we call
the quark number holonomy is defined as the integral of the quark number
susceptibility along the closed loop of $\theta$ where $\theta$ is the
dimensionless imaginary chemical potential. Expected behavior of the quark
number holonomy at finite temperature is discussed and its asymptotic behaviors
are shown.
