  In order to solve the fine-tuning problem of the cosmological constant, we
propose a simple model with the vacuum energy non-minimally coupled to the
inflaton field. In this model, the vacuum energy decays to the inflaton during
pre-inflation and inflation eras, so that the cosmological constant effectively
deflates from the Planck mass scale to a much smaller one after inflation and
plays the role of dark energy in the late-time of the universe. We show that
our deflationary scenario is applicable to arbitrary slow-roll inflation
models. We also take two specific inflation potentials to illustrate our
results.
