[en] The density-constrained-TDHF method [1] is a fully microscopic theory for calculating heavy-ion interaction potentials and fusion cross sections below and above the fusion barrier. The only input into the theory is the effective interaction (Skyrme force). There are no adjustable parameters. The method is based on the TDHF evolution of the nuclear system slightly above the fusion barrier, coupled with density-constrained Hartree-Fock calculations. This approach incorporates all of the dynamical entrance channel effects such as neck formation, particle transfer, internal excitations and dynamical deformation effects. We will discuss applications to fusion reactions (6^4Ni+1^32Sn, 6^4Ni+6^4Ni, 4^0Ca+9^0Zr, 1^6O+2^08Pb). We shall also investigate in more detail the effects of neutron transfer on fusion [2] and calculation of fission process using the TDHF theory.(author)