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In this paper, we investigate some characteristics of phantomReissner-Nordstr\"om-de Sitter (RN-dS) black holes. The peculiar feature ofphantom field renders this kind of black holes quite different from theircounterparts. We can only find at most two horizons in this spacetime, i.e.event horizon and cosmological horizon. For the black hole charge parameter, wefind that it is not bounded from below. We calculate quasinormal modes (QNMs)frequencies of massless neutral scalar field perturbation in this black holespacetime, and some properties related to the large charge parameter aredisclosed.

Quasinormal modes of phantom Reissner-Nordstr\"om-de Sitter black holes