  We study Brans-Dicke cosmology with an inverse power-law effective potential.
By using dynamical analyses, we search for fixed points corresponding to the
radiation-like matter and dark energy-dominated era of our Universe, and the
stability of fixed points is also investigated. We find phase space
trajectories which are attracted to the stable point of the dark
energy-dominated era from unstable fixed points like matter-dominated era of
the Universe. The dark energy comes from effective potentials of the
Brans-Dicke field, whose variation (related to the time-variation of the
gravitational coupling constant) is shown to be in good agreement with
observational data.
