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Complex frequencies associated with quasinormal modes for large Reissner-Nordström Anti-de Sitter black holes have been computed. These frequencies have close relation to the black hole charge and do not linearly scale with the black hole temperature as in Schwarzschild Anti-de Sitter case. In terms of AdS/CFT correspondence, we found that the bigger the black hole charge is, the quicker for the approach to thermal equilibrium in the CFT. The properties of quasinormal modes for l>0 have also been studied. PACS number(s): 04.30.Nk, 04.70.B