  Using a theory of large amplitude collective motion, the adiabatic
self-consistent collective coordinate method, we derive reaction path for the
fusion process at sub-barrier energies. The collective Hamiltonian to describe
the fusion process is constructed, based on the obtained reaction path and
canonical variables. We study the reaction of N=Z stable nuclei, alpha+16O,
16O+16O, and alpha+12C. The results suggest that, after two nuclei touch, the
reaction path is significantly deviated from the simple relative motion, which
may affect the deep sub-barrier fusion cross section.
