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The low latitude ionospheric data observed by digisonde at Hainan station(19.5o N,109.1o E)during nearly quiet time from 2002 to 2012 have been analyzed to explore the diurnal,seasonal,annual variations and solar activity dependences of the ionospheric peak parameters(foF2,hmF2,and Chapman scale height Hm),as well as some comparison with IRI-2012 modeling predictions.