Abstract: Based on the synthetic studies both in field and laboratory of bauxite in Bacun of Yuzhou Cityin Henan Province, this paper analyzes the metallogenetic environment and mineralization , metallogenicmechanism and metallogenic model of the ore from the perspectives of regional background, geologicafeatures, quality, composition, genesis and the ore-forming environments. The comparative analysisshows that this ore mainly occurs in the Upper Carboniferous Benxi Formation of the Ordos Basin and be-ongs to lacustrine colloidal deposit. The research results can give insights into the searching of bauxite inthe Upper Carboniferous Benxi Formation in the paraplatform of North China.

Key words: lacustrine colloidal deposition, the Upper Carboniferous Benxi Formation, bauxite in Bacunof Yuzhou City in Henan Province , ore genesis, metallogenic model