  The solution to large-scale power deficit in the cosmic microwave background
fluctuations may be relevant with the physics in the preinflationry period, and
significantly depends on whether the initial conditions are set as Bunch-Davies
vacuum or thermal ground state. We show the primordial cosmological
perturbations based on the preinflationary model with three phases at different
thermal initial conditions. The influences of different thermal initial states
are studied by the detailed discussions of the adjusting role of model
parameters on the power spectrum. Finally, this paper gives the solution to
large-scale power deficit in the cosmic microwave background fluctuations.
