The crab spiders (Araneae: Thomisidae) collected from Hainan Island, China are studied. A total of 25 genera, 43 species are reported, including 12 new species, two new combinations and one new synonym. The new species are: Borboropactus brevidens sp. nov., Borboropactus edentatus sp. nov., Borboropactus longidens sp. nov., Lycopus longissimus sp. nov., Lysiteles furcatus sp. nov., Lysiteles leptosiphus sp. nov., Oxytate multa sp. nov., Ozyptila biprominula sp. nov., Paraborboropactus liangweii sp. nov., Paraborboropactus oblatus sp. nov., Thomisops altus sp. nov., Thomisus eminulus sp. nov. The species Philodamia gongi (Yin et al, 2004) comb. nov. is transferred from Tmarus and Sinothomisus hainanus (Song, 1994) comb. nov. from Xysticus. The species Lysiteles guangxiensis He & Hu, 1999 is a junior synonym of Alcimochthes limbatus Simon, 1885. The true females of B. hainanus Song, 1993 and Lysiteles minusculus Song & Chai, 1990 are described for the first time.