In this paper, two component reaction-diffusion systems with
a specific bistable nonlinearity are concerned. The systems have the
bifurcation structure of pitch-fork type of traveling front
solutions with opposite velocities, which is
rigorously proved and the ordinary differential equations
describing the dynamics of such traveling front solutions
are also derived explicitly. It enables us to know
rigorously precise information on the dynamics of
traveling front solutions. As an application of this result,
the imperfection structure under small perturbations and
the dynamics of traveling front solutions on heterogeneous media
are discussed.