  We show that the study of hidden conformal symmetry that associates to the
Kerr/CFT correspondence can also apply to the cosmological horizon in
Kerr-Newman-Taub-NUT-de Sitter spacetime. This symmetry allows one to employ
some two dimensional conformal field theory methods to understand the
properties of the cosmological horizon. The entropy can be understood by using
the Cardy formula, and the equation for scattering process in the near region
has an agreement with the one obtained from a two point function in two
dimensional conformal field theory. We also show that pair production can occur
near the cosmological horizon in Kerr-Newman-Taub-NUT-de Sitter for near
extremal conditions.
